Practicing the Bridges in Mathematics Grade 2 Student Book Answer Key Unit 7 Measurement, Fractions & Multi-Digit Computation with Hungry Ants will help students analyze their knowledge of concepts.
Bridges in Mathematics Grade 2 Student Book Answer Key Unit 7 Measurement, Fractions & Multi-Digit Computation with Hungry Ants
Bridges in Mathematics Grade 2 Student Book Unit 7 Module 1 Session 2 Answer Key
Army Ant Ruler Record Sheet
Question 1.
Use your army ant ruler. Find at least 4 things in the room that are:
- about 1 centimeter long
- between 1 and 10 centimeters long
- about 10 centimeters long
Fill in this chart to show what you find.
Answer:
Explanation:
Four things in the room are:
About 1 centimeter – Tablet, Rice, Button, Marbles.
Between 1 and 10 centimeters long – Pencil, Book, Folk spoon, God picture.
About 10 centimeters long – Comb, Shampoo bottle, Dinning table, Mobile.
Question 2.
Measure these lines with your ant ruler. Label each line to show how long it is.
Answer:
Explanation:
Length of the given lines:
A. 13cm.
B. 8cm
C. 10cm.
D. 9cm.
Bridges in Mathematics Grade 2 Student Book Unit 7 Module 1 Session 3 Answer Key
Estimate & Measure Centimeters
Question 1.
Use your army ant ruler to estimate and measure length in centimeters.
Write down your estimate. How many centimeters long do you think it is?
Measure the length with your ruler.
Record the answer.
a. Object:
My Estimate: ____________ cm
Length in Centimeters: _____________ cm
Answer:
My Estimate: 3 cm.
Length in Centimeters: 2 cm.
Explanation:
Estimation Length of the Eraser = 3 cm.
Actual length of the Eraser = 2cm.
b. Object:
My Estimate: ____________ cm
Length in Centimeters: _____________ cm
Answer:
My Estimate: 5 cm.
Length in Centimeters: 3 cm.
Explanation:
Estimation Length of the Glue Stick = 5 cm.
Actual length of the Glue Stick = 3 cm.
c. Object:
My Estimate: ____________ cm
Length in Centimeters: _____________ cm
Answer:
My Estimate: 6 cm.
Length in Centimeters: 5 cm.
Explanation:
Estimation Length of the Calculator = 6 cm.
Actual length of the Calculator = 5 cm.
d. Object:
My Estimate: ____________ cm
Length in Centimeters: _____________ cm
Answer:
My Estimate: 6 cm.
Length in Centimeters: 5 cm.
Explanation:
Estimation Length of the Pencil = 6 cm.
Actual length of the Pencil = 5 cm.
e. Object:
My Estimate: ____________ cm
Length in Centimeters: _____________ cm
Answer:
My Estimate: 9 cm.
Length in Centimeters: 7 cm.
Explanation:
Estimation Length of the Unifix cubes = 9 cm.
Actual length of the Unifix cubes = 7 cm.
f. Object:
My Estimate: ____________ cm
Length in Centimeters: _____________ cm
Answer:
My Estimate: 1.5 cm.
Length in Centimeters: 1 cm.
Explanation:
Estimation Length of the Pointer finger = 1.5 cm.
Actual length of the Pointer finger = 1 cm.
Bridges in Mathematics Grade 2 Student Book Unit 7 Module 2 Session 2 Answer Key
Fair Shares
Solve the problems below with your paper granola bars. Be sure to label each ant’s share.
Question 1.
What happens when 2 ants share 1 granola bar?
Answer:
Portion of granola bar each ant gets = \(\frac{1}{2}\).
Explanation:
Number of ants to share = 2.
Number of granola bar to share = 1.
Portion of granola bar each ant gets = Number of granola bar to share ÷ Number of ants to share
= 1 ÷ 2
= \(\frac{1}{2}\).
Question 2.
What happens when 3 ants share 1 granola bar?
Answer:
Portion of granola bar each ant gets = \(\frac{1}{3}\).
Explanation:
Number of ants to share = 3.
Number of granola bar to share = 1.
Portion of granola bar each ant gets = Number of granola bar to share ÷ Number of ants to share
= 1 ÷ 3
= \(\frac{1}{3}\).
Question 3.
What happens when 4 ants share 1 granola bar?
Answer:
Portion of granola bar each ant gets = \(\frac{1}{4}\).
Explanation:
Number of ants to share = 4.
Number of granola bar to share = 1.
Portion of granola bar each ant gets = Number of granola bar to share ÷ Number of ants to share
= 1 ÷ 4
= \(\frac{1}{4}\).
Solve the problems below with your paper granola bars. Be sure to label each ant’s share.
Question 1.
What happens when 2 ants share 2 granola bars?
Answer:
Portion of granola bar each ant gets = 1.
Explanation:
Number of ants to share = 2.
Number of granola bar to share = 2.
Portion of granola bar each ant gets = Number of granola bar to share ÷ Number of ants to share
= 2 ÷ 2
= 1.
Question 2.
What happens when 3 ants share 2 granola bars?
Answer:
Portion of granola bar each ant gets = \(\frac{2}{3}\).
Explanation:
Number of ants to share = 3.
Number of granola bar to share = 2.
Portion of granola bar each ant gets = Number of granola bar to share ÷ Number of ants to share
= 2 ÷ 3
= \(\frac{2}{3}\).
Question 3.
What happens when 4 ants share 2 granola bars?
Answer:
Portion of granola bar each ant gets = \(\frac{1}{2}\).
Explanation:
Number of ants to share = 4.
Number of granola bar to share = 2.
Portion of granola bar each ant gets = Number of granola bar to share ÷ Number of ants to share
= 2 ÷ 4
= 1 ÷ 2
= \(\frac{1}{2}\).
Bridges in Mathematics Grade 2 Student Book Unit 7 Module 2 Session 4 Answer Key
Bug Spinner Record Sheet 1
You are going to spin the arrow on your half and half spinner 24 times. Color in the mini-graph below to show what you think will happen. Then take turns spinning and marking the large graph to see what really does happen.
We predict that the arrow will land on the ladybug ___________ times out of 24.
We predict that the arrow will land on the mantis ___________ times out of 24.
We think it will turn out this way because:
Here’s what really happened:
Ladybugs came up ____________ times. Mantises came up ____________ times.
Answer:
Ladybugs came up 12 times.
Mantises came up 12 times.
Explanation:
Spining results of spinning 20 times:
Lady bug = 10 times.
Grasshopper = 10 times.
We predict that the arrow will land on the ladybug 12 times out of 24.
We predict that the arrow will land on the mantis 12 times out of 24.
Graph:
Here’s what really happened:
Bridges in Mathematics Grade 2 Student Book Unit 7 Module 2 Session 5 Answer Key
Bug Spinner Record Sheet 2
You are going to spin the arrow on your one-quarter and three-quarter spinner 24 times. Color in the mini-graph below to show what you think will happen. Then take turns spinning and marking the large graph to see what really does happen.
We predict that the arrow will land on the ladybug ____________ times out of 24.
We predict that the arrow will land on the mantis ____________ times out of 24.
We think it will turn out this way because:
Here’s what really happened:
Ladybugs came up ____________ times. Mantises came up ____________ times.
Answer:
Ladybugs came up 6 times.
Mantises came up 18 times.
Explanation:
=> one-quarter of 20 = \(\frac{1}{4}\) × 20 = 5.
Ladybugs came up 5 times.
=> three-quarter of 20 = \(\frac{3}{4}\) × 20 = \(\frac{3}{1}\) × 5 = 15.
Mantises came up 15 times.
You are going to spin the arrow on your one-quarter and three-quarter spinner 24 times.
=> one-quarter of 24 = \(\frac{1}{4}\) × 24 = 6.
Ladybugs came up 6 times.
=> three-quarter of 24 = \(\frac{3}{4}\) × 24 = \(\frac{3}{1}\) × 6 = 18.
Mantises came up 18 times.
Graph:
We predict that the arrow will land on the ladybug 6 times out of 24.
We predict that the arrow will land on the mantis 18 times out of 24.
Bridges in Mathematics Grade 2 Student Book Unit 7 Module 3 Session 4 Answer Key
More Toy Store Problems
Solve each problem using one of the strategies on the class charts.
- Show all of your work.
- Write the answer on the line.
- Tell which strategy you used to solve the problem.
Question 1.
The Ants’ Toy Store decided to start selling toy trains. On Monday, the store received 175 train cars. On Wednesday, a truck delivered 216 more train cars. How many train cars does the store have in all?
The store has ____________ train cars.
The name of the strategy I used is _______________.
Answer:
Number of train cars the store have in all = 391.
The store has 391 train cars.
The name of the strategy I used is Addition.
Explanation:
Number of train cars on Monday the store received = 175.
Number of train cars more on Wednesday a truck delivered = 216.
Number of train cars the store have in all = Number of train cars on Monday the store received + Number of train cars more on Wednesday a truck delivered
= 175 + 216
= 391.
Question 2.
One morning the store sold 148 kites. The toy store had 262 kites. How many kites did the store have left after it sold the kites?
The store had ______________ kites left after it sold the kites.
The name of the strategy I used is _______________.
Answer:
Number of kites the store have left after it sold the kites = 114.
The store had 114 kites left after it sold the kites.
The name of the strategy I used is Subtraction.
Explanation:
Number of kites one morning the store sold = 148.
Total number of kits the toy store has = 262.
Number of kites the store have left after it sold the kites = Total number of kits the toy store has – Number of kites one morning the store sold
= 262 – 148
= 114.
Question 3.
Last month the Ants’ Toy Store had a coloring contest. There were 128 entries, and 74 of them were from girls. How many were from boys?
________________ of the entries in the coloring contest were from boys.
The name of the strategy I used is ____________.
Answer:
Number of boys entires the Ants’ Toy Store had a coloring contest had = 54.
54 of the entries in the coloring contest were from boys.
The name of the strategy I used is Subtraction.
Explanation:
Number of entires the Ants’ Toy Store had a coloring contest had = 128.
Number of girls entires the Ants’ Toy Store had a coloring contest had = 74.
Number of boys entires the Ants’ Toy Store had a coloring contest had = Number of entires the Ants’ Toy Store had a coloring contest had – Number of girls entires the Ants’ Toy Store had a coloring contest had
= 128 – 74
= 54.
Question 4.
CHALLENGE The Ants’ Toy store has two boxes of bags for customers. One box has 128 bags and the other has 211 bags. A truck delivers another box of bags and now the store has a total of 416 bags. How many bags did the truck deliver?
The truck delivered ____________ bags.
The name of the strategy I used is ________________.
Answer:
Number of bags the truck delivers = 77.
The truck delivered 77 bags.
The name of the strategy I used is addition and subtraction.
Explanation:
Number of bags one box has = 128.
Number of bags other box has = 211.
Total number of bags the store has now = 416.
Number of bags the truck delivers = Total number of bags the store has now – (Number of bags one box has + Number of bags other box has)
= 416 – (128 + 211)
= 416 – 339
= 77.