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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 211 · 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 136 =
  2. 2.Double 62 =
  3. 3.Half of 34 =
  4. 4.Half of 172 =
  5. 5.Double 46 =
  6. 6.Half of 180 =
  7. 7.Half of 70 =
  8. 8.Double 45 =
  9. 9.Double 59 =
  10. 10.Double 36 =
  11. 11.Half of 116 =
  12. 12.Half of 198 =
  13. 13.Double 52 =
  14. 14.Half of 184 =
  15. 15.Half of 32 =
  16. 16.Half of 88 =
  17. 17.Double 48 =
  18. 18.Half of 40 =
  19. 19.Half of 176 =
  20. 20.Half of 38 =
  21. 21.Half of 66 =
  22. 22.Double 58 =
  23. 23.Half of 106 =
  24. 24.Double 68 =
  25. 25.Half of 78 =
  26. 26.Half of 54 =
  27. 27.Half of 186 =
  28. 28.Double 47 =
  29. 29.Half of 102 =
  30. 30.Double 92 =
  31. 31.Half of 100 =
  32. 32.Half of 140 =
  33. 33.Double 19 =
  34. 34.Double 93 =
  35. 35.Double 71 =
  36. 36.Double 28 =
  37. 37.Half of 26 =
  38. 38.Half of 192 =
  39. 39.Double 32 =
  40. 40.Half of 42 =

Answer key

  1. 68
  2. 124
  3. 17
  4. 86
  5. 92
  6. 90
  7. 35
  8. 90
  9. 118
  10. 72
  11. 58
  12. 99
  13. 104
  14. 92
  15. 16
  16. 44
  17. 96
  18. 20
  19. 88
  20. 19
  21. 33
  22. 116
  23. 53
  24. 136
  25. 39
  26. 27
  27. 93
  28. 94
  29. 51
  30. 184
  31. 50
  32. 70
  33. 38
  34. 186
  35. 142
  36. 56
  37. 13
  38. 96
  39. 64
  40. 21

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