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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 556 · 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 41 =
  2. 2.Double 69 =
  3. 3.Double 93 =
  4. 4.Half of 192 =
  5. 5.Half of 164 =
  6. 6.Double 51 =
  7. 7.Double 28 =
  8. 8.Half of 186 =
  9. 9.Double 26 =
  10. 10.Double 59 =
  11. 11.Half of 162 =
  12. 12.Double 61 =
  13. 13.Double 63 =
  14. 14.Double 67 =
  15. 15.Half of 170 =
  16. 16.Double 78 =
  17. 17.Half of 38 =
  18. 18.Double 94 =
  19. 19.Half of 62 =
  20. 20.Half of 40 =
  21. 21.Half of 178 =
  22. 22.Double 57 =
  23. 23.Half of 118 =
  24. 24.Half of 76 =
  25. 25.Double 81 =
  26. 26.Half of 28 =
  27. 27.Double 19 =
  28. 28.Double 21 =
  29. 29.Double 98 =
  30. 30.Half of 196 =
  31. 31.Half of 82 =
  32. 32.Half of 136 =
  33. 33.Double 32 =
  34. 34.Double 97 =
  35. 35.Double 88 =
  36. 36.Half of 78 =
  37. 37.Double 36 =
  38. 38.Double 76 =
  39. 39.Half of 64 =
  40. 40.Double 56 =

Answer key

  1. 82
  2. 138
  3. 186
  4. 96
  5. 82
  6. 102
  7. 56
  8. 93
  9. 52
  10. 118
  11. 81
  12. 122
  13. 126
  14. 134
  15. 85
  16. 156
  17. 19
  18. 188
  19. 31
  20. 20
  21. 89
  22. 114
  23. 59
  24. 38
  25. 162
  26. 14
  27. 38
  28. 42
  29. 196
  30. 98
  31. 41
  32. 68
  33. 64
  34. 194
  35. 176
  36. 39
  37. 72
  38. 152
  39. 32
  40. 112

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