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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 243 · 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 29 =
  2. 2.Half of 122 =
  3. 3.Half of 64 =
  4. 4.Double 94 =
  5. 5.Half of 58 =
  6. 6.Double 61 =
  7. 7.Half of 60 =
  8. 8.Half of 172 =
  9. 9.Double 88 =
  10. 10.Double 42 =
  11. 11.Half of 104 =
  12. 12.Double 41 =
  13. 13.Half of 170 =
  14. 14.Half of 56 =
  15. 15.Half of 132 =
  16. 16.Double 55 =
  17. 17.Half of 80 =
  18. 18.Double 45 =
  19. 19.Double 54 =
  20. 20.Double 71 =
  21. 21.Double 83 =
  22. 22.Double 62 =
  23. 23.Half of 34 =
  24. 24.Half of 118 =
  25. 25.Half of 128 =
  26. 26.Half of 84 =
  27. 27.Half of 124 =
  28. 28.Half of 68 =
  29. 29.Double 39 =
  30. 30.Double 35 =
  31. 31.Double 59 =
  32. 32.Half of 144 =
  33. 33.Half of 196 =
  34. 34.Double 64 =
  35. 35.Half of 26 =
  36. 36.Half of 154 =
  37. 37.Double 98 =
  38. 38.Half of 44 =
  39. 39.Double 51 =
  40. 40.Half of 100 =

Answer key

  1. 58
  2. 61
  3. 32
  4. 188
  5. 29
  6. 122
  7. 30
  8. 86
  9. 176
  10. 84
  11. 52
  12. 82
  13. 85
  14. 28
  15. 66
  16. 110
  17. 40
  18. 90
  19. 108
  20. 142
  21. 166
  22. 124
  23. 17
  24. 59
  25. 64
  26. 42
  27. 62
  28. 34
  29. 78
  30. 70
  31. 118
  32. 72
  33. 98
  34. 128
  35. 13
  36. 77
  37. 196
  38. 22
  39. 102
  40. 50

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