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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 649 · 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 22 =
  2. 2.Double 95 =
  3. 3.Half of 60 =
  4. 4.Double 74 =
  5. 5.Double 27 =
  6. 6.Double 64 =
  7. 7.Double 62 =
  8. 8.Double 79 =
  9. 9.Half of 164 =
  10. 10.Half of 66 =
  11. 11.Half of 138 =
  12. 12.Half of 96 =
  13. 13.Double 69 =
  14. 14.Half of 88 =
  15. 15.Double 59 =
  16. 16.Double 29 =
  17. 17.Double 33 =
  18. 18.Half of 76 =
  19. 19.Half of 160 =
  20. 20.Double 84 =
  21. 21.Half of 50 =
  22. 22.Double 99 =
  23. 23.Half of 100 =
  24. 24.Double 24 =
  25. 25.Double 81 =
  26. 26.Half of 162 =
  27. 27.Double 42 =
  28. 28.Half of 106 =
  29. 29.Half of 74 =
  30. 30.Double 49 =
  31. 31.Double 58 =
  32. 32.Double 41 =
  33. 33.Half of 82 =
  34. 34.Half of 104 =
  35. 35.Double 87 =
  36. 36.Half of 64 =
  37. 37.Double 56 =
  38. 38.Double 52 =
  39. 39.Double 92 =
  40. 40.Half of 68 =

Answer key

  1. 44
  2. 190
  3. 30
  4. 148
  5. 54
  6. 128
  7. 124
  8. 158
  9. 82
  10. 33
  11. 69
  12. 48
  13. 138
  14. 44
  15. 118
  16. 58
  17. 66
  18. 38
  19. 80
  20. 168
  21. 25
  22. 198
  23. 50
  24. 48
  25. 162
  26. 81
  27. 84
  28. 53
  29. 37
  30. 98
  31. 116
  32. 82
  33. 41
  34. 52
  35. 174
  36. 32
  37. 112
  38. 104
  39. 184
  40. 34

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