G3T13.2: Adding mentally using the compensation strategy Flashcards
1
Q
39+14=
Method:
39+1 14-1
40+13=
39+14=
A
53
2
Q
37+59
Method:
37-1 59+1
36+60=
37+59=
A
96
3
Q
49+36
A
85
4
Q
29+15
A
44
5
Q
39+22
A
61
6
Q
26+29
A
55
7
Q
37+49
A
86
8
Q
43+49
A
92
9
Q
390+140
Method:
390+10 140-10
400+130=
390+140=
A
530
10
Q
490+230
A
720
11
Q
150+490
A
640
12
Q
630+290
A
920
13
Q
590+260
A
860
14
Q
590+170
A
760
15
Q
450+290
A
740
