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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 400 · 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 32 =
  2. 2.Double 71 =
  3. 3.Half of 108 =
  4. 4.Double 83 =
  5. 5.Double 23 =
  6. 6.Double 81 =
  7. 7.Double 64 =
  8. 8.Double 69 =
  9. 9.Half of 92 =
  10. 10.Double 21 =
  11. 11.Double 88 =
  12. 12.Half of 72 =
  13. 13.Double 61 =
  14. 14.Double 92 =
  15. 15.Half of 78 =
  16. 16.Double 47 =
  17. 17.Double 49 =
  18. 18.Half of 36 =
  19. 19.Double 87 =
  20. 20.Half of 70 =
  21. 21.Double 41 =
  22. 22.Double 74 =
  23. 23.Half of 172 =
  24. 24.Double 82 =
  25. 25.Double 93 =
  26. 26.Half of 52 =
  27. 27.Half of 56 =
  28. 28.Half of 144 =
  29. 29.Double 75 =
  30. 30.Double 98 =
  31. 31.Half of 40 =
  32. 32.Half of 136 =
  33. 33.Double 35 =
  34. 34.Half of 66 =
  35. 35.Half of 64 =
  36. 36.Double 91 =
  37. 37.Double 29 =
  38. 38.Half of 124 =
  39. 39.Double 72 =
  40. 40.Double 17 =

Answer key

  1. 16
  2. 142
  3. 54
  4. 166
  5. 46
  6. 162
  7. 128
  8. 138
  9. 46
  10. 42
  11. 176
  12. 36
  13. 122
  14. 184
  15. 39
  16. 94
  17. 98
  18. 18
  19. 174
  20. 35
  21. 82
  22. 148
  23. 86
  24. 164
  25. 186
  26. 26
  27. 28
  28. 72
  29. 150
  30. 196
  31. 20
  32. 68
  33. 70
  34. 33
  35. 32
  36. 182
  37. 58
  38. 62
  39. 144
  40. 34

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