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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 67 · 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 19 =
  2. 2.Half of 176 =
  3. 3.Half of 60 =
  4. 4.Half of 54 =
  5. 5.Half of 42 =
  6. 6.Double 61 =
  7. 7.Half of 106 =
  8. 8.Double 82 =
  9. 9.Double 87 =
  10. 10.Half of 154 =
  11. 11.Double 73 =
  12. 12.Half of 182 =
  13. 13.Half of 140 =
  14. 14.Double 24 =
  15. 15.Double 66 =
  16. 16.Double 98 =
  17. 17.Half of 198 =
  18. 18.Half of 144 =
  19. 19.Half of 30 =
  20. 20.Double 37 =
  21. 21.Double 97 =
  22. 22.Double 68 =
  23. 23.Double 21 =
  24. 24.Double 85 =
  25. 25.Double 23 =
  26. 26.Half of 40 =
  27. 27.Half of 128 =
  28. 28.Double 63 =
  29. 29.Double 17 =
  30. 30.Double 81 =
  31. 31.Double 31 =
  32. 32.Half of 44 =
  33. 33.Double 57 =
  34. 34.Half of 166 =
  35. 35.Double 18 =
  36. 36.Double 47 =
  37. 37.Double 43 =
  38. 38.Half of 100 =
  39. 39.Half of 46 =
  40. 40.Half of 130 =

Answer key

  1. 38
  2. 88
  3. 30
  4. 27
  5. 21
  6. 122
  7. 53
  8. 164
  9. 174
  10. 77
  11. 146
  12. 91
  13. 70
  14. 48
  15. 132
  16. 196
  17. 99
  18. 72
  19. 15
  20. 74
  21. 194
  22. 136
  23. 42
  24. 170
  25. 46
  26. 20
  27. 64
  28. 126
  29. 34
  30. 162
  31. 62
  32. 22
  33. 114
  34. 83
  35. 36
  36. 94
  37. 86
  38. 50
  39. 23
  40. 65

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