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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 398 · 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 44 =
  2. 2.Double 62 =
  3. 3.Half of 194 =
  4. 4.Double 33 =
  5. 5.Half of 66 =
  6. 6.Double 87 =
  7. 7.Double 88 =
  8. 8.Half of 136 =
  9. 9.Half of 166 =
  10. 10.Half of 34 =
  11. 11.Half of 186 =
  12. 12.Half of 106 =
  13. 13.Double 61 =
  14. 14.Double 72 =
  15. 15.Half of 144 =
  16. 16.Half of 48 =
  17. 17.Double 78 =
  18. 18.Double 18 =
  19. 19.Half of 54 =
  20. 20.Double 49 =
  21. 21.Double 77 =
  22. 22.Half of 46 =
  23. 23.Double 21 =
  24. 24.Half of 128 =
  25. 25.Half of 40 =
  26. 26.Half of 150 =
  27. 27.Double 69 =
  28. 28.Double 43 =
  29. 29.Half of 72 =
  30. 30.Half of 152 =
  31. 31.Double 71 =
  32. 32.Half of 120 =
  33. 33.Half of 124 =
  34. 34.Half of 28 =
  35. 35.Half of 100 =
  36. 36.Double 52 =
  37. 37.Double 64 =
  38. 38.Half of 88 =
  39. 39.Double 31 =
  40. 40.Double 38 =

Answer key

  1. 88
  2. 124
  3. 97
  4. 66
  5. 33
  6. 174
  7. 176
  8. 68
  9. 83
  10. 17
  11. 93
  12. 53
  13. 122
  14. 144
  15. 72
  16. 24
  17. 156
  18. 36
  19. 27
  20. 98
  21. 154
  22. 23
  23. 42
  24. 64
  25. 20
  26. 75
  27. 138
  28. 86
  29. 36
  30. 76
  31. 142
  32. 60
  33. 62
  34. 14
  35. 50
  36. 104
  37. 128
  38. 44
  39. 62
  40. 76

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