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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 286 · 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 59 =
  2. 2.Half of 74 =
  3. 3.Double 42 =
  4. 4.Double 86 =
  5. 5.Double 33 =
  6. 6.Double 75 =
  7. 7.Half of 152 =
  8. 8.Double 18 =
  9. 9.Half of 66 =
  10. 10.Half of 122 =
  11. 11.Double 17 =
  12. 12.Half of 40 =
  13. 13.Double 57 =
  14. 14.Double 76 =
  15. 15.Double 38 =
  16. 16.Double 41 =
  17. 17.Half of 72 =
  18. 18.Double 55 =
  19. 19.Half of 34 =
  20. 20.Double 54 =
  21. 21.Double 98 =
  22. 22.Double 34 =
  23. 23.Half of 144 =
  24. 24.Double 71 =
  25. 25.Half of 52 =
  26. 26.Half of 88 =
  27. 27.Double 95 =
  28. 28.Double 77 =
  29. 29.Double 47 =
  30. 30.Double 44 =
  31. 31.Half of 32 =
  32. 32.Half of 190 =
  33. 33.Half of 182 =
  34. 34.Double 24 =
  35. 35.Double 91 =
  36. 36.Double 79 =
  37. 37.Double 31 =
  38. 38.Double 92 =
  39. 39.Half of 158 =
  40. 40.Half of 124 =

Answer key

  1. 118
  2. 37
  3. 84
  4. 172
  5. 66
  6. 150
  7. 76
  8. 36
  9. 33
  10. 61
  11. 34
  12. 20
  13. 114
  14. 152
  15. 76
  16. 82
  17. 36
  18. 110
  19. 17
  20. 108
  21. 196
  22. 68
  23. 72
  24. 142
  25. 26
  26. 44
  27. 190
  28. 154
  29. 94
  30. 88
  31. 16
  32. 95
  33. 91
  34. 48
  35. 182
  36. 158
  37. 62
  38. 184
  39. 79
  40. 62

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