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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 580 · 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 16 =
  2. 2.Double 81 =
  3. 3.Half of 84 =
  4. 4.Double 49 =
  5. 5.Half of 192 =
  6. 6.Half of 130 =
  7. 7.Half of 40 =
  8. 8.Double 75 =
  9. 9.Half of 94 =
  10. 10.Double 77 =
  11. 11.Half of 126 =
  12. 12.Half of 82 =
  13. 13.Half of 162 =
  14. 14.Half of 198 =
  15. 15.Half of 58 =
  16. 16.Double 82 =
  17. 17.Half of 80 =
  18. 18.Half of 36 =
  19. 19.Double 96 =
  20. 20.Half of 140 =
  21. 21.Double 72 =
  22. 22.Half of 26 =
  23. 23.Double 91 =
  24. 24.Half of 86 =
  25. 25.Half of 184 =
  26. 26.Double 36 =
  27. 27.Double 32 =
  28. 28.Double 63 =
  29. 29.Half of 70 =
  30. 30.Double 26 =
  31. 31.Half of 134 =
  32. 32.Half of 160 =
  33. 33.Double 66 =
  34. 34.Half of 120 =
  35. 35.Double 74 =
  36. 36.Half of 148 =
  37. 37.Half of 108 =
  38. 38.Half of 74 =
  39. 39.Double 85 =
  40. 40.Half of 158 =

Answer key

  1. 32
  2. 162
  3. 42
  4. 98
  5. 96
  6. 65
  7. 20
  8. 150
  9. 47
  10. 154
  11. 63
  12. 41
  13. 81
  14. 99
  15. 29
  16. 164
  17. 40
  18. 18
  19. 192
  20. 70
  21. 144
  22. 13
  23. 182
  24. 43
  25. 92
  26. 72
  27. 64
  28. 126
  29. 35
  30. 52
  31. 67
  32. 80
  33. 132
  34. 60
  35. 148
  36. 74
  37. 54
  38. 37
  39. 170
  40. 79

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