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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 53 · 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 31 =
  2. 2.Double 66 =
  3. 3.Double 61 =
  4. 4.Half of 56 =
  5. 5.Half of 178 =
  6. 6.Double 56 =
  7. 7.Half of 40 =
  8. 8.Half of 48 =
  9. 9.Half of 68 =
  10. 10.Double 63 =
  11. 11.Half of 58 =
  12. 12.Double 41 =
  13. 13.Half of 84 =
  14. 14.Double 47 =
  15. 15.Half of 76 =
  16. 16.Half of 70 =
  17. 17.Double 79 =
  18. 18.Half of 112 =
  19. 19.Double 73 =
  20. 20.Half of 134 =
  21. 21.Double 23 =
  22. 22.Half of 26 =
  23. 23.Half of 116 =
  24. 24.Double 81 =
  25. 25.Double 51 =
  26. 26.Double 27 =
  27. 27.Half of 110 =
  28. 28.Half of 118 =
  29. 29.Half of 30 =
  30. 30.Double 98 =
  31. 31.Half of 142 =
  32. 32.Double 36 =
  33. 33.Half of 186 =
  34. 34.Half of 140 =
  35. 35.Double 37 =
  36. 36.Half of 158 =
  37. 37.Half of 62 =
  38. 38.Double 74 =
  39. 39.Double 42 =
  40. 40.Half of 66 =

Answer key

  1. 62
  2. 132
  3. 122
  4. 28
  5. 89
  6. 112
  7. 20
  8. 24
  9. 34
  10. 126
  11. 29
  12. 82
  13. 42
  14. 94
  15. 38
  16. 35
  17. 158
  18. 56
  19. 146
  20. 67
  21. 46
  22. 13
  23. 58
  24. 162
  25. 102
  26. 54
  27. 55
  28. 59
  29. 15
  30. 196
  31. 71
  32. 72
  33. 93
  34. 70
  35. 74
  36. 79
  37. 31
  38. 148
  39. 84
  40. 33

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