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

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

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

Q 4: Write 7 + 8 in doubles plus one form. 9 + 1 + 5 = 15 8 + 4 + 3 = 15 6 + 7 + 2 = 15 7 + 7 + 1 = 15

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

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

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Question 8: This question is available to subscribers only!

