Mental Math
Rounding to the Nearest 10
Estimation
(Sum)
Estimation
(difference)
Word Problems
100
112 + 14 =
126
100
What is 86 rounded to the nearest 10?
90
100
Find the sum of 20 and 475.
495
100
Find the difference between 384 and 7.
377
100
A school bag costs $37. What is $37 rounded to the nearest ten?
40
200
50 + 16 =
66
200
What is 39 rounded to the nearest 10?
40
200
Find the sum of 50 and 321.
371
200
Find the difference of 128 and 6.
122
200
A pair of shoes cost $11. $11 is ___ rounded to the nearest ten.
$10
300
71 + 6 =
77
300
What is 65 rounded to the nearest 10?
70
300
Find the sum of 79 and 216.
295
300
Find the difference of 68 and 4.
64
300
A textbook cost $95. $95 is __ rounded to the nearest ten.
$100
400
181 + 14 =
195
400
What is 342 rounded to the nearest 10?
340
400
Find the sum of 451 and 206.
656
400
Find the difference of 235 and 21.
214
400
Ron has $80. He wants to buy a toy for $45 and a game for $56. If Ron rounds the prices to the nearest ten, will he have enough money?
No, the items will cost $110.
500
250 + 14 =
264
500
What is 981 rounded to the nearest 10?
980
500
Find the sum of 450 and 327.
777
500
Find the difference between 335 and 30.
305
500
Lucy has $20. She wants to buy a stuffed animal for $7 and a candy bar for $3. If Lucy rounds the items to the nearest 10, will she have enough money?
Yes, the items will cost $10.
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