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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 455 · 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 86 =
  2. 2.Double 89 =
  3. 3.Half of 124 =
  4. 4.Double 21 =
  5. 5.Double 57 =
  6. 6.Double 63 =
  7. 7.Half of 136 =
  8. 8.Double 53 =
  9. 9.Half of 52 =
  10. 10.Double 51 =
  11. 11.Double 42 =
  12. 12.Double 31 =
  13. 13.Double 72 =
  14. 14.Half of 154 =
  15. 15.Half of 176 =
  16. 16.Double 16 =
  17. 17.Half of 144 =
  18. 18.Double 93 =
  19. 19.Half of 32 =
  20. 20.Double 69 =
  21. 21.Double 87 =
  22. 22.Half of 170 =
  23. 23.Double 56 =
  24. 24.Half of 34 =
  25. 25.Double 66 =
  26. 26.Double 26 =
  27. 27.Double 52 =
  28. 28.Double 18 =
  29. 29.Double 17 =
  30. 30.Double 94 =
  31. 31.Double 81 =
  32. 32.Half of 58 =
  33. 33.Half of 84 =
  34. 34.Double 32 =
  35. 35.Half of 164 =
  36. 36.Half of 62 =
  37. 37.Double 85 =
  38. 38.Double 38 =
  39. 39.Half of 30 =
  40. 40.Double 76 =

Answer key

  1. 43
  2. 178
  3. 62
  4. 42
  5. 114
  6. 126
  7. 68
  8. 106
  9. 26
  10. 102
  11. 84
  12. 62
  13. 144
  14. 77
  15. 88
  16. 32
  17. 72
  18. 186
  19. 16
  20. 138
  21. 174
  22. 85
  23. 112
  24. 17
  25. 132
  26. 52
  27. 104
  28. 36
  29. 34
  30. 188
  31. 162
  32. 29
  33. 42
  34. 64
  35. 82
  36. 31
  37. 170
  38. 76
  39. 15
  40. 152

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