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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 348 · 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 37 =
  2. 2.Double 38 =
  3. 3.Half of 46 =
  4. 4.Half of 124 =
  5. 5.Double 98 =
  6. 6.Double 41 =
  7. 7.Half of 144 =
  8. 8.Half of 74 =
  9. 9.Half of 186 =
  10. 10.Double 66 =
  11. 11.Half of 168 =
  12. 12.Double 83 =
  13. 13.Half of 100 =
  14. 14.Half of 36 =
  15. 15.Double 85 =
  16. 16.Half of 42 =
  17. 17.Half of 92 =
  18. 18.Half of 104 =
  19. 19.Half of 64 =
  20. 20.Double 54 =
  21. 21.Half of 26 =
  22. 22.Half of 44 =
  23. 23.Double 43 =
  24. 24.Double 32 =
  25. 25.Double 53 =
  26. 26.Half of 158 =
  27. 27.Double 57 =
  28. 28.Half of 162 =
  29. 29.Half of 134 =
  30. 30.Double 71 =
  31. 31.Double 88 =
  32. 32.Double 39 =
  33. 33.Half of 184 =
  34. 34.Double 23 =
  35. 35.Half of 94 =
  36. 36.Double 21 =
  37. 37.Double 92 =
  38. 38.Half of 62 =
  39. 39.Double 84 =
  40. 40.Half of 28 =

Answer key

  1. 74
  2. 76
  3. 23
  4. 62
  5. 196
  6. 82
  7. 72
  8. 37
  9. 93
  10. 132
  11. 84
  12. 166
  13. 50
  14. 18
  15. 170
  16. 21
  17. 46
  18. 52
  19. 32
  20. 108
  21. 13
  22. 22
  23. 86
  24. 64
  25. 106
  26. 79
  27. 114
  28. 81
  29. 67
  30. 142
  31. 176
  32. 78
  33. 92
  34. 46
  35. 47
  36. 42
  37. 184
  38. 31
  39. 168
  40. 14

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