1) Write some whole numbers which can go into the empty Space: 67 <____ < 75  2) What is the rule for this sequence? 3, 8, 13. 18, 23, 28... 3) I think of a number. I multiply it by 3. The answer is 21. What is the number? 4) Write all the factors of 30. 5) Write three consecutive numbers which add up to 30. 6) What do I need to subtract from 32 to get to 17? 7) Which number is seventy three greater than one hundred and thirty five? 8) What must be added to 323 to make 500? 9) How many tens are in two hundred and ten? 10) What is a quarter of five hundred? 11) Add together 18 and half of 18. 12) Write down some whole numbers which can complete this: 76 < ____ < 102 13) What is the rule for this sequence: 1, 3, 9, 27, 81,... 14) I think of a number. I multiply it by 2 and add 5. I get a final answer of 23. What was my original number? 15) Write down all the factors of 25. 16) Write down three consecutive numbers which add up to 24 17) What do I need to subtract from 45 to get to 22? 18) What number is 27 greater than one hundred and thirty-two? 19) What is a third of 900? 20) Add together 34 and half of 34.  21) What do I need to add to 1532 to get 2000? 22) How many tens are in nine hundred and twenty three?

Number Puzzles

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