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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 192 · 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 99 =
  2. 2.Double 71 =
  3. 3.Half of 112 =
  4. 4.Double 91 =
  5. 5.Double 33 =
  6. 6.Half of 110 =
  7. 7.Double 29 =
  8. 8.Double 86 =
  9. 9.Half of 80 =
  10. 10.Double 41 =
  11. 11.Half of 134 =
  12. 12.Double 55 =
  13. 13.Half of 58 =
  14. 14.Double 51 =
  15. 15.Double 28 =
  16. 16.Double 48 =
  17. 17.Half of 172 =
  18. 18.Double 81 =
  19. 19.Double 21 =
  20. 20.Double 25 =
  21. 21.Double 31 =
  22. 22.Half of 164 =
  23. 23.Half of 144 =
  24. 24.Half of 160 =
  25. 25.Half of 128 =
  26. 26.Double 22 =
  27. 27.Half of 54 =
  28. 28.Double 18 =
  29. 29.Half of 146 =
  30. 30.Double 35 =
  31. 31.Half of 162 =
  32. 32.Half of 180 =
  33. 33.Double 26 =
  34. 34.Double 95 =
  35. 35.Half of 88 =
  36. 36.Half of 70 =
  37. 37.Half of 140 =
  38. 38.Half of 38 =
  39. 39.Half of 32 =
  40. 40.Double 37 =

Answer key

  1. 198
  2. 142
  3. 56
  4. 182
  5. 66
  6. 55
  7. 58
  8. 172
  9. 40
  10. 82
  11. 67
  12. 110
  13. 29
  14. 102
  15. 56
  16. 96
  17. 86
  18. 162
  19. 42
  20. 50
  21. 62
  22. 82
  23. 72
  24. 80
  25. 64
  26. 44
  27. 27
  28. 36
  29. 73
  30. 70
  31. 81
  32. 90
  33. 52
  34. 190
  35. 44
  36. 35
  37. 70
  38. 19
  39. 16
  40. 74

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