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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 275 · 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 89 =
  2. 2.Double 94 =
  3. 3.Half of 132 =
  4. 4.Double 61 =
  5. 5.Half of 36 =
  6. 6.Half of 40 =
  7. 7.Half of 30 =
  8. 8.Half of 184 =
  9. 9.Half of 144 =
  10. 10.Double 32 =
  11. 11.Double 37 =
  12. 12.Double 65 =
  13. 13.Half of 182 =
  14. 14.Double 26 =
  15. 15.Half of 46 =
  16. 16.Double 83 =
  17. 17.Half of 178 =
  18. 18.Half of 84 =
  19. 19.Half of 124 =
  20. 20.Double 98 =
  21. 21.Half of 42 =
  22. 22.Double 68 =
  23. 23.Half of 102 =
  24. 24.Half of 196 =
  25. 25.Half of 156 =
  26. 26.Half of 150 =
  27. 27.Half of 94 =
  28. 28.Half of 136 =
  29. 29.Double 54 =
  30. 30.Double 51 =
  31. 31.Half of 166 =
  32. 32.Double 88 =
  33. 33.Half of 120 =
  34. 34.Double 78 =
  35. 35.Half of 116 =
  36. 36.Double 71 =
  37. 37.Half of 170 =
  38. 38.Double 76 =
  39. 39.Double 96 =
  40. 40.Double 58 =

Answer key

  1. 178
  2. 188
  3. 66
  4. 122
  5. 18
  6. 20
  7. 15
  8. 92
  9. 72
  10. 64
  11. 74
  12. 130
  13. 91
  14. 52
  15. 23
  16. 166
  17. 89
  18. 42
  19. 62
  20. 196
  21. 21
  22. 136
  23. 51
  24. 98
  25. 78
  26. 75
  27. 47
  28. 68
  29. 108
  30. 102
  31. 83
  32. 176
  33. 60
  34. 156
  35. 58
  36. 142
  37. 85
  38. 152
  39. 192
  40. 116

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