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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 74 · 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 62 =
  2. 2.Half of 164 =
  3. 3.Double 17 =
  4. 4.Double 84 =
  5. 5.Half of 142 =
  6. 6.Half of 32 =
  7. 7.Double 94 =
  8. 8.Half of 160 =
  9. 9.Half of 78 =
  10. 10.Double 88 =
  11. 11.Double 25 =
  12. 12.Half of 70 =
  13. 13.Half of 166 =
  14. 14.Double 89 =
  15. 15.Half of 108 =
  16. 16.Double 98 =
  17. 17.Half of 90 =
  18. 18.Half of 150 =
  19. 19.Double 45 =
  20. 20.Double 82 =
  21. 21.Half of 114 =
  22. 22.Half of 100 =
  23. 23.Half of 36 =
  24. 24.Double 91 =
  25. 25.Double 43 =
  26. 26.Double 66 =
  27. 27.Double 81 =
  28. 28.Double 31 =
  29. 29.Double 61 =
  30. 30.Half of 180 =
  31. 31.Double 49 =
  32. 32.Double 39 =
  33. 33.Double 16 =
  34. 34.Double 28 =
  35. 35.Half of 30 =
  36. 36.Half of 104 =
  37. 37.Double 72 =
  38. 38.Half of 172 =
  39. 39.Double 55 =
  40. 40.Double 24 =

Answer key

  1. 124
  2. 82
  3. 34
  4. 168
  5. 71
  6. 16
  7. 188
  8. 80
  9. 39
  10. 176
  11. 50
  12. 35
  13. 83
  14. 178
  15. 54
  16. 196
  17. 45
  18. 75
  19. 90
  20. 164
  21. 57
  22. 50
  23. 18
  24. 182
  25. 86
  26. 132
  27. 162
  28. 62
  29. 122
  30. 90
  31. 98
  32. 78
  33. 32
  34. 56
  35. 15
  36. 52
  37. 144
  38. 86
  39. 110
  40. 48

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