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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 757 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 74 =
  2. 2.Half of 136 =
  3. 3.Double 37 =
  4. 4.Double 23 =
  5. 5.Double 63 =
  6. 6.Double 42 =
  7. 7.Half of 180 =
  8. 8.Double 16 =
  9. 9.Half of 172 =
  10. 10.Double 62 =
  11. 11.Double 18 =
  12. 12.Half of 84 =
  13. 13.Half of 88 =
  14. 14.Half of 66 =
  15. 15.Half of 68 =
  16. 16.Double 56 =
  17. 17.Double 34 =
  18. 18.Half of 112 =
  19. 19.Half of 36 =
  20. 20.Half of 100 =
  21. 21.Half of 80 =
  22. 22.Double 73 =
  23. 23.Half of 176 =
  24. 24.Half of 40 =
  25. 25.Double 65 =
  26. 26.Double 21 =
  27. 27.Double 69 =
  28. 28.Half of 178 =
  29. 29.Double 19 =
  30. 30.Half of 198 =
  31. 31.Double 45 =
  32. 32.Half of 26 =
  33. 33.Half of 56 =
  34. 34.Half of 194 =
  35. 35.Half of 138 =
  36. 36.Half of 182 =
  37. 37.Half of 78 =
  38. 38.Double 31 =
  39. 39.Double 55 =
  40. 40.Double 51 =

Answer key

  1. 37
  2. 68
  3. 74
  4. 46
  5. 126
  6. 84
  7. 90
  8. 32
  9. 86
  10. 124
  11. 36
  12. 42
  13. 44
  14. 33
  15. 34
  16. 112
  17. 68
  18. 56
  19. 18
  20. 50
  21. 40
  22. 146
  23. 88
  24. 20
  25. 130
  26. 42
  27. 138
  28. 89
  29. 38
  30. 99
  31. 90
  32. 13
  33. 28
  34. 97
  35. 69
  36. 91
  37. 39
  38. 62
  39. 110
  40. 102

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