When I __________, I take away the lesser number from the greater number.
subtract
100
Estimate. Round each number to the indicated place value.
579-246; tens
580-250=330
100
Find the unknown.
95-77=?
95-77=18
100
Use addition to check this subtraction problem. If the answer is correct, write "correct." If it is incorrect, solve the problem to write the correct answer.
2,496-1,348=1,148
Correct
100
Should you estimate or find the exact answer?
Jon bought 783 feet of fencing. Anna bought 195 feet of fencing. How many more feet of fencing did Jon buy than Anna?
Exact answer
200
The answer to a subtraction problem is called the _________.
difference
200
Estimate. Round each number to the indicated place value.
875-623; hundreds
900-600=300
200
Subtract to find the unknown.
576-321=?
576-321=255
200
Subtract to find the unknown.
8,053-2,187=?
8,053-2,187=5,866
200
There are 31 days in December. 14 days in December were snowy. Write a number sentence to find the number of days that were not snowy.
31 days-14 days=17 days
300
When I do not need an exact answer, I can _________ to find one that is reasonable.
estimate
300
Subtract mentally by breaking apart the smaller number.
448-59
448-60=388
388+1=389
300
Use addition to check to see if this subtraction problem is correct. If it is correct, write "correct." If the problem is incorrect, solve it to correct it.
402-127=285
The problem is incorrect!
402-127=275
300
Subtract to find the unknown.
732-610
732-610=122
300
Ben wants to make 240 cookies. So far, he has made 57 cookies. How many more cookies does Ben need to make?
A. 186 cookies
B. 84 cookies
C. 183 cookies
D. 182 cookies.
C. 183 cookies
400
I can __________ to trade equal amounts when renaming a number.
regroup
400
Subtract mentally by "making a ten."
995-51
995-50=945
945-1=944
400
Subtract to find the unknown.
1,207-940=?
1,207-940=267
400
Check this subtraction problem using the inverse operation. If the answer is correct, write "correct." If it is incorrect, solve the subtraction problem.
175-39=133
Incorrect
175-39=136
400
Should you find an estimate or the exact answer?
Alex bought 140 stamps. Ashleigh bought 265 stamps. About how many more stamps did Ashleigh buy than than Alex?
Estimate
500
Two operations that can undo each other, as in addition and subtraction, are called __________.
inverse operations
500
Estimate. Round each number to the indicated place value.
1,250-999; thousands
1,000-1,000=0
500
Subtract to find the unknown.
9,000-7,002=
9,000-7,002=1,998
500
Solve to find the unknown.
8,429-7,537=?
8,429-7,537=892
500
Use addition to find each unknown.
640-__ __ 0=430