All the solutions provided inÂ McGraw Hill My Math Grade 2 Answer Key PDF Chapter 7 Review will give you a clear idea of the concepts.

Vocabulary Check

place value
regroup
subtract

Write the correct word in the blank.

Question 1.
To identify the value of the digit 9 in the numbers 976, 93, and 9, use what you know about _____________.
place value.

Explanation:
By identifying the value of the digit 9 in the numbers 976, 93, and 9, which is called place value.
Example: The place value of 9 in 976 is thousands
93 is hundreds
9 is called one’s place.

Question 2.
You can ____________ to find the difference.
Subtract

Explanation:
You can subtract to find the difference.
Example:
9 – 6 = 3
By subtracting the given numbers we can get the difference.

Question 3.
To take a number apart and write it a new way is to ________________.
Regroup

Explanation:
To take a number apart and write it in a new way is to regroup.

Concept Check

Subtract.

Question 4.
600 – 400 = _____________
200

Explanation:
The minuend is 600 and subtrahend is 400. The difference between them is 200 which is 600 – 400 = 200.

Question 5.
700 – 600 = _______________
100

Explanation:
The minuend is 700 and subtrahend is 600. The difference between them is 100 which is 700 – 600 = 100.

Question 6.

400

Explanation:
The minuend is 800 and subtrahend is 400. The difference between them is 400 which is 800 – 400 = 400.

Question 7.

300

Explanation:
The minuend is 900 and subtrahend is 600. The difference between them is 300 which is 900 – 600 = 300.

Question 8.

673

Explanation:
The minuend is 773 and subtrahend is 100. The difference between them is 673 which is 773 – 100 = 673.

Question 9.

251

Explanation:
The minuend is 261 and subtrahend is 10. The difference between them is 251 which is 261 – 10 = 251.

Question 10.

609

Explanation:
The minuend is 938 and subtrahend is 329. The difference between them is 609 which is 938 – 329 = 609.

Question 11.

869

Explanation:
The minuend is 885 and subtrahend is 16. The difference between them is 869 which is 885 – 16 = 869.

Question 12.

168

Explanation:
The minuend is 357 and subtrahend is 189. The difference between them is 168 which is 357 – 189 = 168.

Question 13.

389

Explanation:
The minuend is 987 and subtrahend is 598. The difference between them is 389 which is 987 – 598 = 398.

Question 14.

77

Explanation:
The minuend is 201 and subtrahend is 124. The difference between them is 77 which is 201 – 124 = 77.

Rewrite the problem. Subtract.

Question 15.
385 – 166

119

Explanation:
1. First, subtract one column at a time, starting with the one’s place.
2. If the top digit doesn’t have enough digits, borrow from the next higher value.
3. Next subtract the ones and tens column.
4. Finally subtract the hundreds column. The difference is 119.

Question 16.
247 – 189

158

Explanation:
1. First, subtract one column at a time, starting with the one’s place.
2. If the top digit doesn’t have enough digits, borrow from the next higher value.
3. Next subtract the ones and tens column.
4. Finally subtract the hundreds column. The difference is 158.

Question 17.
925 – 638

287

Explanation:
. First, subtract one column at a time, starting with the one’s place.
2. If the top digit doesn’t have enough digits, borrow from the next higher value.
3. Next subtract the ones and tens column.
4. Finally subtract the hundreds column. The difference is 287.

Subtract.

Question 18.

146

Explanation:
1. First, subtract one column at a time, starting with the one’s place.
2. If the top digit doesn’t have enough digits, borrow from the next higher value.
3. Next subtract the ones and tens column.
4. Finally subtract the hundreds column. The difference is 146.

Question 19.

257

Explanation:

Question 20.

146

Explanation:

Problem Solving

Question 21.
There are 620 buttons. 200 of them are square. The rest are round. How many buttons are round?

____________ buttons
420 buttons

Explanation:
Given,
There are 620 buttons. 200 of them are square.
The difference between the given numbers is 620 – 200 = 420 buttons.

Question 22.
Clara had 359 pennies. She lost some. Now she has 266 pennies. How many pennies did Clara lose?

____________ pennies
93 pennies.

Explanation:
Given,
Clara had 359 pennies. Now she has 266 pennies.
The minuend is 201 and subtrahend is 124.
The difference between them is 359 – 266 = 93 pennies.

Test Practice

Question 23.
There are 334 cars in the parking lot on Sunday. On Monday, there are 182 cars. How many more cars were there on Sunday?
(A) 334
(B) 182
(C) 152
(D) 150
152 cars were there on Sunday.

Explanation:
Given,
There are 334 cars in the parking lot on Sunday.
On Monday, there are 182 cars.
334 – 182 = 152 cars.

Reflect

Show the ways to subtract three-digit numbers.

Subtract hundreds.
800 – 500 = _____________
800 – 500 = 300

Explanation:
Given,
800 – 500
8 – 5 = 3
800 – 500 = 300
The minuend is 800 and subtrahend is 500. The difference between them is 300 which is 800 – 500 = 300.

Regroup tens to subtract.

109

Explanation:
1. First, subtract one column at a time, starting with the one’s place.
2. If the top digit doesn’t have enough digits, borrow from the next higher value.
3. Next subtract the ones and tens column.
4. Finally subtract the hundreds column. The difference is 109.

Regroup tens and hundreds to subtract.

538

Explanation:
1. First, subtract one column at a time, starting with the one’s place.
2. If the top digit doesn’t have enough digits, borrow from the next higher value.
3. Next subtract the ones and tens column.
4. Finally subtract the hundreds column. The difference is 538.

Rewrite to subtract.
381 – 298