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Missing numbers - 3

Which number is missing. Work with a friend.

♦ Read the list of numbers.

♦ Decide what number fits the gap.

♦ When you know what the missing number is, write it down on a piece of paper. When you have answered all of the questions select the buttons next to the each question to see if you are right.

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3 , _ , 9 , 12 , 15.

6

15 , _ , 21 , 24 , 27.

18

33 , 36 , _ , 42 , 45.

39

78 , _ , 84 , 87, 90.

81

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