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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 416 · 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.Double 32 =
  2. 2.Half of 54 =
  3. 3.Double 99 =
  4. 4.Half of 76 =
  5. 5.Double 78 =
  6. 6.Double 42 =
  7. 7.Double 61 =
  8. 8.Double 91 =
  9. 9.Half of 28 =
  10. 10.Double 92 =
  11. 11.Double 64 =
  12. 12.Double 19 =
  13. 13.Double 25 =
  14. 14.Half of 74 =
  15. 15.Half of 98 =
  16. 16.Double 31 =
  17. 17.Double 39 =
  18. 18.Half of 126 =
  19. 19.Half of 136 =
  20. 20.Half of 72 =
  21. 21.Half of 40 =
  22. 22.Double 86 =
  23. 23.Half of 190 =
  24. 24.Half of 66 =
  25. 25.Half of 192 =
  26. 26.Half of 42 =
  27. 27.Double 82 =
  28. 28.Half of 84 =
  29. 29.Double 63 =
  30. 30.Double 79 =
  31. 31.Half of 176 =
  32. 32.Half of 132 =
  33. 33.Half of 198 =
  34. 34.Double 43 =
  35. 35.Double 95 =
  36. 36.Double 41 =
  37. 37.Half of 146 =
  38. 38.Double 51 =
  39. 39.Double 83 =
  40. 40.Half of 102 =

Answer key

  1. 64
  2. 27
  3. 198
  4. 38
  5. 156
  6. 84
  7. 122
  8. 182
  9. 14
  10. 184
  11. 128
  12. 38
  13. 50
  14. 37
  15. 49
  16. 62
  17. 78
  18. 63
  19. 68
  20. 36
  21. 20
  22. 172
  23. 95
  24. 33
  25. 96
  26. 21
  27. 164
  28. 42
  29. 126
  30. 158
  31. 88
  32. 66
  33. 99
  34. 86
  35. 190
  36. 82
  37. 73
  38. 102
  39. 166
  40. 51

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