Q 1: Write 8 + 9 in doubles plus one form. 9 + 6 + 2 = 17 8 + 8 + 1 = 17 6 + 6 + 5 = 17 7 + 7 + 3 = 17

Q 2: Write 6 + 7 in doubles plus one form. 8 + 2 + 3 = 13 5 + 5 + 3 = 13 7 + 4 + 2 = 13 6 + 6 + 1 = 13

Q 3: Write 3 + 4 in doubles plus one form. 3 + 3 + 1 = 7 5 + 1 + 1 = 7 4 + 0 + 3 = 7 2 + 2 + 3 = 7

Q 4: Write 4 + 5 in doubles plus one form. 6 + 2 + 1 = 9 2 + 2 + 5 = 9 4 + 4 + 1 = 9 3 + 5 + 1 = 9

Q 5: Write 12 + 13 in doubles plus one form. 11 + 11 + 1 = 25 12 + 12 + 0 = 25 13 + 11 + 1 = 28 12 + 12 + 1 = 25

Q 6: Write 25 + 26 in doubles plus one form. 25 + 25 + 1 = 51 25 + 26 + 1 = 51 24 + 25 + 2 = 51 23 + 24 + 1 = 51

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