All the solutions provided in McGraw Hill My Math Grade 2 Answer Key PDF Chapter 7 Review will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 2 Chapter 7 Review Answer Key
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 _____________.
Answer:
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.
Answer:
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 ________________.
Answer:
Regroup
Explanation:
To take a number apart and write it in a new way is to regroup.
Concept Check
Subtract.
Question 4.
600 – 400 = _____________
Answer:
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 = _______________
Answer:
100
Explanation:
The minuend is 700 and subtrahend is 600. The difference between them is 100 which is 700 – 600 = 100.
Question 6.
Answer:
400
Explanation:
The minuend is 800 and subtrahend is 400. The difference between them is 400 which is 800 – 400 = 400.
Question 7.
Answer:
300
Explanation:
The minuend is 900 and subtrahend is 600. The difference between them is 300 which is 900 – 600 = 300.
Question 8.
Answer:
673
Explanation:
The minuend is 773 and subtrahend is 100. The difference between them is 673 which is 773 – 100 = 673.
Question 9.
Answer:
251
Explanation:
The minuend is 261 and subtrahend is 10. The difference between them is 251 which is 261 – 10 = 251.
Question 10.
Answer:
609
Explanation:
The minuend is 938 and subtrahend is 329. The difference between them is 609 which is 938 – 329 = 609.
Question 11.
Answer:
869
Explanation:
The minuend is 885 and subtrahend is 16. The difference between them is 869 which is 885 – 16 = 869.
Question 12.
Answer:
168
Explanation:
The minuend is 357 and subtrahend is 189. The difference between them is 168 which is 357 – 189 = 168.
Question 13.
Answer:
389
Explanation:
The minuend is 987 and subtrahend is 598. The difference between them is 389 which is 987 – 598 = 398.
Question 14.
Answer:
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
Answer:
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
Answer:
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
Answer:
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.
Answer:
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.
Answer:
257
Explanation:
Question 20.
Answer:
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
Answer:
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
Answer:
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
Answer:
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 = _____________
Answer:
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.
Answer:
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.
Answer:
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
Answer:
83
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 83.
The difference between the given number 381 – 298 = 83
