Section A
21
10
+ 8
+ 2 3
1 4
2 3
+ 1
Put in the missing numbers.
a. 23, 24, __________, 26, 27, ____________
b. 11, 12, 13, _________, __________, 16
c. 51, 52, 53, _________, __________, 56
d. 29, ________, 31, __________, 33, 34
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