Parts-and-Total Situations

Family Note
Parts-and-total situations are also known as “putting together” or “taking apart” situations. Two or more quantities (parts) are put together to make a total, or a total number is separated into parts. Children are asked to find the total or a missing part in a number story. This is one of many kinds of addition and subtraction number stories your child solves in first grade.

Question 1.
Jenny answered every test question. She got 5 right and 3 wrong. How many questions were on the test? ________ questions
Total number of questions in the test = 8 or Eight. Explanation:
Number of questions Jenny wrote right = 5 or Five.
Number of questions Jenny wrote wrong =3 or Three.
Total number of questions in the test = Number of questions Jenny wrote right + Number of questions Jenny wrote wrong
= 5 + 3
= 8 or Eight.

Question 2.
There are 10 kids on Kevin’s team. 8 are boys. The rest are girls. How many girls are on the team? _______ girls
Number of girls on Kevin’s team = 2 or Two. Explanation:
Total number of kids on Kevin’s team = 10 or Ten.
Number of boys on Kevin’s team = 8 or Eight.
Number of girls on Kevin’s team = Total number of kids on Kevin’s team – Number of boys on Kevin’s team
= 10 – 8
= 2 or Two.

Practice
Question 3.
Count by 1s.
43, 44, ______, ______, ______, ______
43, 44, __45__, __46__, __47__, __ 48 __.
Explanation:
Counting by 1s.
Missing number are:
45 , 46 , 47 , 48.

Practicing Number Stories

Family Note
Today your child practiced solving number stories and shared problem-solving strategies. To solve number stories, children learn that they must first make sense of the stories, then carry out the operations. Do not expect your child to have mastered these skills yet. There will be many more opportunities to practice solving number stories throughout the year.

Question 1.
Solve. Explain your strategy to someone at home. Walt was at the carnival. He had 8 carnival tickets and 2 pens. He traded 4 tickets for 1 more pen.
How many tickets does Walt have now? _______tickets
How many pens does Walt have now? _______ pens
Number of carnival tickets Walt has now = 4 or Four.
Number of pens Walt has now = 3 or Three.

Explanation:
Total number of carnival tickets Walt has = 8 or Eight.
Total number of pens Walt has = 2 or Two.
Number of carnival tickets Walt has traded = 4 or Four.
Number of carnival tickets Walt has now = Total number of carnival tickets Walt has – Number of carnival tickets Walt has traded
= 8 – 4
= 4 or Four.
Number of pens Walt got in Trading = 1 or one.
Number of pens Walt has now = Total number of pens Walt has + Number of pens Walt got in Trading
= 2 + 1
= 3 or Three.

Question 2.
Write a number story that matches this number sentence.
4 + 3 = 7
Total number of chocolates we both have = 7 or Seven.

Explanation:
Number of chocolates I have with me = 4 or Four.
Number of chocolates My friend has with him = 3 or Three.
Total number of chocolates we both have = Number of chocolates I have with me + Number of chocolates My friend has with him
= 4 + 3
= 7 or Seven.

Practice
Count up to solve.
Question 3.
What number is 4 more than 12?
Number 4 more than 12 = 16.

Explanation:
Number 4 more than 12 = 12 + 4 = 16.

Question 4.
What number is 3 more than 17?
Number 3 more than 17 = 20.

Explanation:
Number 3 more than 17 = 17 + 3 = 20.

Question 5.
What number is 9 more than 26?

Explanation:
Number 9 more than 26 = 26 + 9 = 35.

Ordering Objects by Length

Family Note
Today your child explored length by directly comparing the lengths of objects side-by-side. This activity helps prepare children to compare lengths of objects indirectly and to measure length more formally. In the next unit, your child will begin to measure length using items in the classroom, such as blocks and paper clips. Children also explored doubles facts and counted a collection of objects. Children also counted the number of chair legs in the classroom and wrote number models for matching pairs.

Question 1.
Find two things in your home that are about the same length. Draw pictures of them. Explanation:
Two things in my home that are about the same length are my grandfather’s chair and my father’s laptop.

Question 2.
Find two things that have very different lengths. Draw pictures of them. Explanation:
Two things that have very different lengths in my home are our window in bed room and our dinning table.

Practice
Question 3.
Start at 2. Count up 3. Where do you land? __________
Start at 3. Count up 2. Where do you land? _________
Did you end at the same number for both? _________
Yes, I have end at the same number for both.

Explanation:
Starting at 2. Counting  up 3.
Number = 2 + 3 = 5 or Five.
Starting at 3. Counting up 2.
Number = 3 + 2 = 5 or Five.

Number Stories

Family Note
Today, your child drew pictures and wrote number models to represent number stories. After your child completes this Home Link, ask him or her to explain how the numbers in the number model are represented in the picture.

Question 1.
Dillon’s family has 5 fish and 3 cats. Draw a picture of the fish and the cats.
How many pets does Dillon’s family have in all?
________ pets
Write a number model.
Total number of pets Dillon’s family has = 8 or Eight. Explanation:
Number of fishes Dillon’s family has = 5 or Five.
Number of cats Dillon’s family has = 3 or three.
Total number of pets Dillon’s family has = Number of fishes Dillon’s family has + Number of cats Dillon’s family has
= 5 + 3
= 8 or Eight.

Practice
Question 2.
Laura had 14 tickets. She bought an eraser. She has 7 tickets left. How many tickets did the eraser cost? 14 – _______ = 7
Number of Tickets the eraser costed = 7 or Seven.

Explanation: Number of Tickets Laura had = 14 or Fourteen.
Number of Tickets Laura has left = 7 or Seven.
Number of Tickets the eraser costed = Number of Tickets Laura had – Number of Tickets Laura has left
= 14 – 7
= 7 or Seven.

Counting on Number Lines

Family Note
Today your child learned many ways to count on a number line. Ask your child to tell you about patterns in number-line counts. Question 1.
Count by 10s. 0, _______, _______
0, ___10____, ___20____.

Explanation: Counting by 10s.
0 , 10 , 20.

Question 2.
Count by 5s. 0, _______, _______, _______, _______
0, __5_____, ___10____, ___15____, ___20____.

Explanation: Counting by 5s.
5 , 10 , 15 , 20.

Question 3.
Count by 2s. 0, _______, _______, _______, _______
0, ___2____, ___4____, ___6____, ___8____.

Explanation: Counting by 2s.
0 , 2 , 4 , 6 , 8 .

Question 4.
Count by 1s. 0, _______, _______, _______, _______
0, ___1____, ___2____, ___3____, ___4____.

Explanation: Counting  by 1s.
1 , 2 , 3 , 4.

Question 5.
How is counting by 5s like counting by 10s?
Counting by 5s is same like counting by 10s because both cases we are doing addition.

Explanation:
Counting by 5s is same like counting by 10s because both cases we are doing addition.
In counting by 5s we add 5.
In counting by 10s we add 10.

Practice
Find the sums.
Question 6. = _______
Sum = 6 + 4 = 10 or Ten.

Explanation: Number of dots in first dice= 6 or Six.
Number of dots in second dice = 4 or Four.
Total number of dots in the dices = Number of dots in first dice + Number of dots in second dice
= 6 + 4
= 10 or Ten.

Question 7. = ________
Sum = 4 + 4 = 8 or Eight.

Explanation: Number of dots in first dice= 4 or Four.
Number of dots in second dice = 4 or Four.
Total number of dots in the dices = Number of dots in first dice + Number of dots in second dice
= 4 + 4
= 8 or Eight.

Family Note
Today your child solved problems like 3 + 2 and 8 – 5 by counting up and back on a number line. Ask your child to show you how to do this.

Draw hops on the number line to help you solve these problems.
Question 1.
9 + 4 = __________  Explanation:
Sum of 9 and 4 = 9 + 4 = 13.

Question 2.
3 + 8 = __________  Explanation:
Sum of 8 and 3 = 8 + 3 = 11 or Eleven.

Question 3.
11 – 4 = _________  Explanation:
Difference of 11 and 4 = 11 – 4 = 7 or Seven.

Practice
Question 4.
Circle the winning card in Top-It. 18 or Eighteen and 12 or Twelve  numbers are not same to twin.

Explanation: There is no twinning card among this both cards because the card numbers are not matching with each other.

More Counting to Add and Subtract

Family Note
Today your child worked with number sentences that have unknowns in different positions. Children solved number sentences such as 4 + ? = 7 and ? – 5 = 3. Ask your child to show how to use a number line to find unknown numbers. For example, to solve 4 + ? = 7, your child might start at 4 and count the number of hops it takes to get to 7.

Find the missing number. Use the number line. Question 1. + 8 = 13
Missing number = 5 or Five.
__5__ + 8 = 13.

Explanation: Question 2. – 9 = 6
Missing number = Fifteen or 15.

Explanation: Difference = 15 – 9 = 6.

Question 3. + 9 = 18
Missing number = 9 or Nine.

Explanation: Sum = 9 + 9 = 18.

Question 4.
5 + = 11
Missing number = 6 or Six.

Explanation: 5 + 6 = 11.

Question 5.
14 – = 7
Missing number = 7 or Seven.

Explanation: 14 – 7 = 7.

Question 6.
12 – = 8
Missing number = 4 or Four.

Explanation: 12 – 4 = 8.

Practice Question 7.
How many flowers in all?
________ flowers
Total number of Flowers in all = 20 or Twenty.

Explanation:
Number of Roses = 5 + 5 + 2 = 10 + 2 = 12 or Twelve.
Number of Daisies =  5 + 3 = 8 or Eight.
Total number of Flowers in all = Number of Roses + Number of Daisies
= 12 + 8
= 20 or Twenty.

Question 8.
Make tally marks to show how many flowers in all. Explanation:
Total number of Flowers in all = 20 or Twenty.

Skip Counting to Add and Subtract

Family Note
Today your child found patterns on the number grid and used them to add and subtract.

Question 1.
Start at 5. Count by 5s.
Draw an X on each square to show the count.  Explanation:
Starting at 5. Counting by 5s.
Numbers are 5 ,10 , 15 , 20 , 25 , 30 , 35 , 40 , 45 , 50.

Question 2.
Use the number grid.
Count by 5s to find the missing numbers.
5 + 5 = __________
20 – 15 = __________
5 + 5 = ____10______.
20 – 15 = ___10_______.

Explanation: Practice

Question 3.
Start at 17. Count up 7 hops. Where do you land?
I have land at 45 number.

Explanation:
Starting at 17. Counting up 7 hops: Question 4.
Start at 21. Count up 10 hops. Where do you land?
I have land at 41 number.

Explanation:
Starting at 21. Counting up 10 hops Question 5.
Start at 25. Count up 14 hops. Where do you land?
I have land at 39 number because after that number is not in the number grid.

Explanation:
Starting at 25. Counting up 14 hops. Question 6.
Start at 28. Count up 18 hops. Where do you land?
I have landed on 28 number because 18 added to it will get 46 number which is not in the number grid.

Explanation:
Starting  at 28. Counting up 18 hops. Frames-and-Arrows Diagrams (cont.)

Family Note
Ask your child to tell you about Frames and Arrows. Take turns making up and solving Frames-and-Arrows problems.

Find the missing numbers.
Question 1. Missing numbers are 7 , 9 , 11 , !5.

Explanation: Question 2. Missing numbers are 17 , 14 , 13.

Explanation: Question 3. Missing numbers are 15 , 20 , 25.

Explanation: Practice
Question 4.
Count hops on the number line to solve. 6 + 3 = ______
________ = 10 – 2
________ = 9 – 5
7 – 4 = ________
6 + 3 = ___9___.
___8_____ = 10 – 2
___4_____ = 9 – 5
7 – 4 = __3______.

Explanation:    Counting Hops on the Number Line

Question 1.
How many hops are between each circled number?
_______ hops There are 3 or Three hops in between each circled numbers.

Explanation: Question 2.
How many hops are between each circled number?
________ hops There are 4 or Four hops in between the each circled numbers.

Explanation: Question 3.
How many hops are between each circled number?
_______ hops There is 2 hops between the each circled number.

Explanation: Try This
Question 4.
How many hops are between each circled number?
__________ hops There is 7 or Seven hops between the each circled numbers.

Explanation: Finding the Rule

Family Note
Today your child worked with Frames-and-Arrows diagrams that had missing rules. You may wish to refer to the Family Note for Lesson 3-9 to review the Frames-and-Arrows routine.

Show someone at home how to find the rules. Then write each rule.
Question 1.  Explanation:
Greatest number – Smaller number = Difference.
=> 5 – 3 = 2 or Two.

Question 2.  Explanation:
Greatest number – Smaller number = Difference.
=> 10 – 5 = 5 or Five.

Question 3.  Explanation:
Greatest number – Smaller number = Difference.
=> 18 – 15 = 3 or Three.

Practice
Question 4.
Draw 35 stars on the back of the page. Explanation:
A star is a five shaped figure.

Counting with Calculators

Family Note
Today your child learned how to program a calculator to count up and back by different numbers. Children connected this counting to addition and subtraction. If you have a calculator at home, program it to skip count and use it to check your child’s work below.

Write the counts.
Question 1.
Start at: 3
Count: up
By: 3s
_______, _______, _______, _______, _______, _______, _______
__3____, ___6____, ___9____, ___12____, __15_____, ___18____, ___21____.

Explanation:
Starting at 3. Counting up by 3s.
Missing numbers are : 3 , 6 , 9 , 12 , 15 , 18 , 21.

Question 2.
Start at: 20
Count: back
By: 2s
_______, _______, _______, _______, _______, _______, _______
___20____, __18_____, ___16____, ___14____, __12_____, ___10____, __8_____.

Explanation:
Starting at 20. Counting back by 2s.
Missing numbers are : 20 , 18 , 16 , 14 , 12, 10 , 8.

Question 3.
Start at: 45
Count: back
By: 5s
_______, _______, _______, _______, _______, _______, _______
__45_____, ___40____, ___35____, __30____, ___25____, ___20____, __15____.

Explanation:
Starting at 45. Counting back by 5s.
Missing numbers are : 45 , 40 , 35 , 30 , 25 , 20 , 15

.

Practice
Question 4.
Write number sentences to show the domino sums. 