Mental Math
Using a mental math strategy what is 287+133=?
420
Round each number to the near hundred to estimate the sum of this math sentence:
473+465
1,000
Add:
215+8,823=
Subtract
831-796=
35
7x6
42
Using the break apart method, break apart 53+88 and find the sum.
141
Round each number to the near hundred to estimate the sum of this math sentence:
586-483
100
Add:
852+138=
990
Subtract:
415-323=
92
8x3
24
Using the break apart method, break apart 676-521 to find the sum.
155
Round each number to the near hundred to estimate the sum of this math sentence:
981+193=
1,200
Add:
14,296
+ 444
_____________
14,740
Subtract:
735-255
480
5x12
60
Using the break apart method, break apart 283-169 to find the sum.
114
Round each number to the near hundred to estimate the sum of this math sentence:
748-392=
300
Add
572+941=
1,513
Subtract:
4,978-2,766=
2,212
20 x 8
160
598
Round each number to the near hundred to estimate the sum of this math sentence:
1,440-933=
500
Add:
14,382 + 9,243=
23,625
Subtract:
651-482=
168
70 x 8=
560