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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 110 · 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 34 =
  2. 2.Half of 94 =
  3. 3.Half of 52 =
  4. 4.Half of 62 =
  5. 5.Half of 114 =
  6. 6.Double 58 =
  7. 7.Double 86 =
  8. 8.Double 18 =
  9. 9.Half of 192 =
  10. 10.Double 85 =
  11. 11.Double 91 =
  12. 12.Double 43 =
  13. 13.Double 63 =
  14. 14.Double 71 =
  15. 15.Double 61 =
  16. 16.Half of 40 =
  17. 17.Half of 138 =
  18. 18.Half of 82 =
  19. 19.Half of 184 =
  20. 20.Double 59 =
  21. 21.Double 64 =
  22. 22.Double 37 =
  23. 23.Double 72 =
  24. 24.Half of 68 =
  25. 25.Half of 144 =
  26. 26.Double 95 =
  27. 27.Double 51 =
  28. 28.Double 31 =
  29. 29.Half of 38 =
  30. 30.Double 16 =
  31. 31.Double 55 =
  32. 32.Double 41 =
  33. 33.Half of 160 =
  34. 34.Half of 48 =
  35. 35.Double 67 =
  36. 36.Half of 176 =
  37. 37.Half of 66 =
  38. 38.Double 36 =
  39. 39.Double 92 =
  40. 40.Double 45 =

Answer key

  1. 17
  2. 47
  3. 26
  4. 31
  5. 57
  6. 116
  7. 172
  8. 36
  9. 96
  10. 170
  11. 182
  12. 86
  13. 126
  14. 142
  15. 122
  16. 20
  17. 69
  18. 41
  19. 92
  20. 118
  21. 128
  22. 74
  23. 144
  24. 34
  25. 72
  26. 190
  27. 102
  28. 62
  29. 19
  30. 32
  31. 110
  32. 82
  33. 80
  34. 24
  35. 134
  36. 88
  37. 33
  38. 72
  39. 184
  40. 90

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