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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 317 · 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.Half of 66 =
  2. 2.Half of 158 =
  3. 3.Double 94 =
  4. 4.Double 33 =
  5. 5.Double 76 =
  6. 6.Half of 96 =
  7. 7.Double 52 =
  8. 8.Half of 54 =
  9. 9.Double 41 =
  10. 10.Double 61 =
  11. 11.Half of 90 =
  12. 12.Half of 64 =
  13. 13.Half of 160 =
  14. 14.Half of 116 =
  15. 15.Double 55 =
  16. 16.Half of 106 =
  17. 17.Half of 176 =
  18. 18.Half of 48 =
  19. 19.Double 71 =
  20. 20.Half of 190 =
  21. 21.Double 81 =
  22. 22.Double 98 =
  23. 23.Half of 76 =
  24. 24.Double 57 =
  25. 25.Half of 32 =
  26. 26.Half of 110 =
  27. 27.Double 23 =
  28. 28.Double 53 =
  29. 29.Half of 26 =
  30. 30.Double 37 =
  31. 31.Double 95 =
  32. 32.Double 64 =
  33. 33.Double 46 =
  34. 34.Double 18 =
  35. 35.Double 31 =
  36. 36.Double 49 =
  37. 37.Double 26 =
  38. 38.Double 51 =
  39. 39.Half of 186 =
  40. 40.Double 56 =

Answer key

  1. 33
  2. 79
  3. 188
  4. 66
  5. 152
  6. 48
  7. 104
  8. 27
  9. 82
  10. 122
  11. 45
  12. 32
  13. 80
  14. 58
  15. 110
  16. 53
  17. 88
  18. 24
  19. 142
  20. 95
  21. 162
  22. 196
  23. 38
  24. 114
  25. 16
  26. 55
  27. 46
  28. 106
  29. 13
  30. 74
  31. 190
  32. 128
  33. 92
  34. 36
  35. 62
  36. 98
  37. 52
  38. 102
  39. 93
  40. 112

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