Mental math addition
8+9=
What strategy?
17
doubles or make 10
46+37=
83
87-54=
33
14-7=
What strategy?
7
Doubles
265+332=
597
7+4=
What strategy?
11
Partners to 10
35+28=
63
68-39=
29
17-9=
What strategy?
8
Think 10 or Near doubles
523+241=
764
8+5=
What strategy?
13
Make 10
57+42=
99
74-37=
37
10-7=
What strategy?
3
Partners to 10
426+351=
777
6+7=
What strategy
13
doubles +1 or -1
58+33=
91
57-16=
41
17-8=
What strategy?
9
Near doubles
272+527=
799
6+9=
What strategy?
15
Make 10
74+18=
92
82-55=
27
15-9=
What strategy?
6
Think 10
486+312=
798