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Addition?
Subtract!
Multiplication!
More Subtraction
10

Mental Math

550 + 250 + 10

810

10

Mental Math

60 - 10 = 

50

10

11x9 =

99

10

99-10=

89

100

Mental Math

135 + 920 =


1,055

100

Mental Math

9 - 15 

-6

100

10 x 10

100

100

100-25=

75

200

Name the strategy represented below:

5 + 5 + 5 +5

Repeated addition

200

562-100

462

200

12 x 12

144

200

350-45=

305

300

Mental Math

865 + 52

917

300

649-349

349

300

12 x 0

0

300

500-150+

350

400

Mental Math

1048 + 200 =

1248

400

Mental Math

250-175

75

400

11 x 3

33

400

999-610=

389