We included HMH Into Math Grade 3 Answer Key PDF Module 9 Review to make students experts in learning maths.

Vocabulary

Associative Property
Commutative
Property of
compatible number
round

Choose the correct term from the Vocabulary box.

Question 1.
When you ___ a number, you replace a number with another number that tells you about how many or how much.
round

Explanation:
When you round a number, you replace a number with another number that tells you about how many or how much.

Question 2.
To find (9 + 7) + 3, I can use the ___ to show 9 + (7 + 3) to find the same sum.
Equal to
19

Explanation:
(9 + 7) + 3 = 9 + (7 + 3)
16 + 3 = 9 + (10)
19 = 19
so both the sum is equal to 19.

Question 3.
A ___ is close to the number and is easy to compute with mentally.
Compatible numbers.

Explanation:
Compatible numbers are the numbers that are easy to add, subtract, multiply, or divide mentally.

Concepts and Skills

Question 4.
Select all the problems that are equal to 143.
A. 181 – 42
B. 126 + 18
C. 97 + 46
D. 250 – 107
E. 219 + 24
97 + 46
250 – 107

Explanation:
The option c. 97 + 46 = 143 and D. 250 -107 = 143 that are equal to 143.

Question 5.
Use Tools Round to the nearest hundred. Tell what strategy or tool you will use to solve the problem, explain your choice, and then find the answer.
536 ___ 672 ____
5370, 6720

Explanation:
We see the digit in the ones place is 6, now round to the nearest multiple of 10 which is smaller than the number. Hence, 536 is nearer to 5370 than 5360.

Question 6.
A Round to the nearest ten.
536 ___ 672 ___
540, 670

Explanation:
There are some rules we need to follow for Rounding off to the Nearest 10.
Rule 1. While rounding off to the nearest ten if the digit in the units place is between 0 to 4 that is < 5 then the unit digit is replaced by 0.
Rule 2. If the digit in the units place is 5 to 9 that is > or 5 but < 10, then the units place is replaced by ‘0’ and the tens place increased by 1.
Now let us slove the given numbers
We see the digit in the ones place is 6, now round off to the nearest multiple of 10 which is greater than the number. Hence, 536 is nearer to 540 than 530.
We see the digit in the ones place is 2, now round to the nearest multiple of 10 which is lesser than the number. Hence, 672 is nearer to 670 than 680.

Question 7.
Use the addition table. Select all the statements that correctly describe how to find the sums that are even numbers. B. Find sums of two odd addends.
C. Find sums of two even addends.
D. Find sums of an even addend and 1.
E. Find sums of an odd addend and 0.

Question 8.
What is the sum of 34, 18, and 6? ____
58.

Explanation:
The sum of given numbers 34 +18 + 6 is 58.

Question 9.
Mrs. Yen buys two items for her kitchen. A table costs $159. A new light costs$128. Mrs. Yen says that the cost of the table and the light will be about $350. Is Mrs. Yen’s statement reasonable? Explain your thinking. Answer: Mrs. Yen’s statement is not reasonable.$159 + $128 =$287.

Explanation:
A table cost $159, new light costs$128.
So the total cost of the items is $287. But Mrs. Yen said the cost of the table and light will be$350. Therefore, Mrs. Yen’s statement is not reasonable.

Question 10.
Dan has saved $162. He wants to buy an e-reader that costs$124. About how much money will he have left after buying the e-reader? Use compatible numbers to estimate.
162-124 = $38 Explanation: Dan has$162.
He wants to buy an e-reader that costs $124. The money he has left after buying the e-reader is$162 – $124 =$38