All the solutions provided in McGraw Hill Math Grade 3 Answer Key PDF Chapter 6 Lesson 7 Multiply by 10 will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 3 Answer Key Chapter 6 Lesson 7 Multiply by 10
Math in My World
Example 1
Orlando found 8 dimes. How much money did Orlando find?
A dime equals 10⊄. Count by tens to find 8 × 10⊄.
8 dimes is ___ ⊄. 8 × 10⊄ = ____ ⊄
So, Orlando found ___ ⊄
Notice the pattern in the products.
Helpful Hint
When you multiply by 10, the product will always end in 0.
3 × 1o = ____
4 × 10 = ____
5 × ___ = ____
6 × ____ = ____
7 × ___ = ____
8 × ____ = ____
Answer:
Given that,
Orlando found 8 dimes.
8 dimes is 80 cents.
8 × 10cents equal to 80 cents.
So, Orlando found 80 cents.
The pattern in the products.
1 x 10 = 10.
2 x 10 = 20.
3 x 10 = 30.
4 x 10 = 40.
5 x 10 = 50.
6 x 10 = 60.
7 x 10 = 70.
8 x 10 = 80.
Example 2
Andrew saw footprints on the beach. He counted 10 toes on each of 3 sets of footprints. How many toes did Andrew count in all? Write a multiplication sentence with a symbol for the unknown.
3 × 10 = 
← unknown
Skip count on a number line. Count three equal jumps of 10.
The number line shows that 3 × 10 = ____. The unknown is ____
So, Andrew counted ____ toes in the sand.
Answer:
Given that,
Andrew saw footprints on the beach.
He counted 10 toes on each of 3 sets of footprints.
Here 3 x 10 = 30.
The unknown is 30.
So, Andrew counted 30 toes in the sand.
Talk Math
How can knowing the 5s facts help you with your 10s facts?
Answer:
The 5s facts is equal to the double of 10s facts.
The 5s facts are
5 x 1 = 5 or 1 x 5 = 5.
5 x 2 = 10 or 2 x 5 = 10.
The 10s facts are
10 x 1 = 10 or 1 x 10 = 10.
10 x 2 = 20 or 2 x 10 = 20.
Guided Practice
Skip count by tens to find each product. Draw lines to match.
Answer:
Question 5.
Complete the pattern.
10, 20, ___, ____, 50, 60, 70, ___, ___, 100
Answer:
Here 10 + 10 = 20.
20 + 10 = 30.
30 + 10 = 40.
40 + 10 = 50.
50 + 10 = 60.
60 + 10 = 70.
70 + 10 = 80.
80 + 10 = 90.
90 + 10 = 100.
The pattern is 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
Independent Practice
Skip count to find each product. Write the addition sentence.
Question 6.
4 × 10 = 10 + ___ + ___ + ____ = ____
Answer:
4 x 10 = 40.
The multiplication of 4 with 10 then you get 40.
The addition sentence is 10 + 10 + 10 + 10 = 40.
Question 7.
6 × 10 = ____ 10 + ___ + ___ + ___ + ____ + ___ = ____
Answer:
6 x 10 = 60.
The multiplication of 6 with 10 then you get 60.
The addition sentence is 10 + 10 + 10 + 10 + 10 + 10 = 60.
Question 8.
3 × 10 = ___ + ___ + ___ = ____
Answer:
3 x 10 = 30.
The multiplication of 3 with 10 then you get 30.
The addition sentence is 10 + 10 + 10 = 30.
Question 9.
5 × 10 = ___ + ___ + ___ + ___ + ____ = ____
Answer:
5 x 10 = 50.
The multiplication of 5 with 10 then you get 50.
The addition sentence is 10 + 10 + 10 + 10 + 10.
Algebra Use the number line to find each unknown.
Question 10.
× 6 = 60
6 × = 60
The unknown is ______
Answer:
10 x 6 = 60.
6 x 10 = 60.
The unknown is 60.
Question 11.
10 × = 10
× 10 = 10
Answer:
10 x 1 = 10.
1 x 10 = 10.
The unknown is 1.
Question 12.
9 × 10 =
10 × 9 =
The unknown is ______
Answer:
9 x 10 = 90.
10 x 9 = 90.
The unknown is 90.
Multiply.
Question 13.
10 × 2 = ____
Answer:
10 x 2 = 20.
Multiplication of 10 with 2 equal to 20.
Question 14.
10 × 6 = ____
Answer:
10 x 6 = 60.
The multiplication of 10 with 6 equal to 60.
Question 15.
10 × 5 = ____
Answer:
10 x 5 = 50.
Multiplication of 10 with 5 equal to 50.
Question 16.
Answer:
10 x 3 = 30.
Multiplication of 10 with 3 equal to 30.
Question 7.
Answer:
9 x 10 = 90.
Multiplication of 9 with 10 equal to 90.
Question 8.
Answer:
10 x 1 = 10.
Multiplication of 10 with 1 then you get 10.
Use the Commutative Property to find each product. Draw a line to match.
Question 9.
Answer:
Problem Solving
Some of the world’s largest glass sculptures are found in the United States. Use the clues in Exercises 22-25 to find the length of each sculpture.
Question 22.
Fiori di Como: 5 less than 7 × 10
Answer:
7 x 10 = 70.
Multiplication of 7 with 10 then you get 70.
5 less than 70 equal to 65.
The length of the Fiori di Como is 65 feet.
Question 23.
Chihuly Tower: 5 more than 10 × 5
Answer:
10 x 5 = 50.
Multiplication of 10 with 5 then you get 50.
5 more than 50 equal to 55.
The length of the Chihuly Tower is 55 feet.
Question 24.
Cobalt Blue Chandelier: 9 more than 2 × 10
Answer:
2 x 10 = 20.
Multiplication of 2 with 10 then you get 20.
9 more than 20 is 29.
The Cobalt Blue Chandelier is 29 feet.
Question 25.
River Blue: 4 more than 10 × 1
Answer:
10 x 1 = 10.
Multiplication of 10 with 1 = 10.
4 more than 10 is 14.
The length of the River blue is 14 feet.
Question 26.
Mathematical PRACTICE 2 Use Number Sense There are 5 giraffes and 10 birds. How many legs are there altogether?
Answer:
Given that,
There are 5 giraffes and 10 birds.
The number of legs of giraffe is 4.
For 4 giraffes 5 x 4 = 20 legs.
Each bird has 2 legs.
For 10 birds 2 x 10 = 20 legs.
The number of legs are 20 + 20 = 40 legs.
Therefore the total number of legs of giraffes and birds is 40 legs.
HOT Problems
Question 27.
Mathematical PRACTICE 2 Reason Explain how you know that a multiplication sentence with a product of 25 cannot be a 10s fact.
Answer:
The 10s fact is
10 x 1 = 10 or 1 x 10 = 10.
10 x 2 = 20 or 2 x 10 = 20
And so on.
The multiplication sentence with a product of 25 is
5 x 5 = 25.
It is not a 10s fact.
Question 28.
? Building on the Essential Question How can I use patterns to multiply numbers by 10?
Answer:
If a number is multiple by 10 then the number increases the 10 times of that number.
Example of the pattern is
1 x 10 = 10.
2 x 10 = 20
McGraw Hill My Math Grade 3 Chapter 6 Lesson 7 My Homework Answer Key
Practice
Skip count by tens to find each product. Write the addition sentence.
Question 1.
5 × 10 = ____
Answer:
5 x 10 = 50.
Multiplication of 5 with 10 then you get 50.
The addition sentence is 10 + 10 + 10 + 10 + 10 = 50.
Question 2.
2 × 10 = ____
Answer:
2 x 10 = 20.
Multiplication of 2 with 10 then you get 20.
The addition sentence is 10 + 10 = 20.
Question 3.
7 × 10 = ____
Answer:
7 x 10 = 70.
Multiplication of 7 with 10 then you get 70.
The addition sentence is 10 + 10 + 10 + 10 + 10 + 10 + 10 = 70.
Question 4.
3 × 10 = ____
Answer:
3 x 10 = 30.
Multiplication of 3 with 10 then you get 30.
The addition sentence is 10 + 10 + 10 = 30.
Algebra Use the number line to find each unknown.
Question 5.
× 4 = 40
4 × = 40
The unknown is ____
Answer:
10 x 4 = 40.
4 x 10 = 40.
It is a commutative property.
The unknown is 10.
Question 6.
10 × = 20
× 10 = 20
The unknown is ____
Answer:
10 x 2 = 20.
2 x 10 = 20.
It is a commutative property.
The unknown is 2.
Question 7.
10 × = 50
× 10 = 50
The unknown is ____
Answer:
10 x 5 = 50.
5 x 10 = 50.
It is commutative property.
The unknown is 5.
Problem Solving
For Exercises 8-9, write a multiplication sentence to solve.
Question 8.
Fiona’s class went on a field trip to the art museum. The class rode in vans with 10 people in each van. How many people went on the field trip if they took 4 full vans?
Answer:
Given that,
Fiona’s class went on a field trip to the art museum.
The class rode in vans with 10 people in each van.
They went on the field trip if they took 4 full vans is 4 x 10 = 40.
Therefore the number of people went to the field trip is 40.
Question 9.
Mathematical PRACTICE 5 Use Math Tools During the football game, Carlos ran with the ball 3 times. Each time, he ran 10 yards. How many yards did Carlos run altogether?
Answer:
Given that,
Carlos ran with the ball 3 times.
Each time, he ran 10 yards.
The number of yards he run is 3 x 10 = 30.
Therefore the total number of yards that Carlos run altogether is 30 yards.
Question 10.
Each time Allison goes to the recycling center, she takes 10 bags of cans. She will go twice this month, 3 times next month, and once the following month. How many bags of cans will Allison take to the recycling center in these three months?
Answer:
Given that,
she takes 10 bags of cans to the recycling center.
She will go twice this month means 20 bags in a month.
3 times next month means 30 bags in the next month.
Once the following month means 10 bags in the month.
Therefore the total number of bags in the 3 months is 20 + 30 + 10 = 60 bags.
Allison take 60 bags to the recycling center in these three months.
Test Practice
Question 11.
Byron has 70 pennies. He stacks them in groups of 10. How many stacks of pennies can Byron make?
A. 7 stacks
B. 8 stacks
C. 9 stacks
D. 10 stacks
Answer:
Given that,
Byron has 70 pennies.
He stacks them in groups of 10.
Here 70/10 = 7 stacks.
Therefore there are 7 stacks in a one group.
Option A is the correct answer.