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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 590 · 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 58 =
  2. 2.Double 29 =
  3. 3.Half of 134 =
  4. 4.Double 68 =
  5. 5.Double 82 =
  6. 6.Half of 38 =
  7. 7.Half of 42 =
  8. 8.Half of 106 =
  9. 9.Half of 124 =
  10. 10.Half of 198 =
  11. 11.Double 21 =
  12. 12.Half of 142 =
  13. 13.Double 36 =
  14. 14.Double 81 =
  15. 15.Half of 64 =
  16. 16.Half of 86 =
  17. 17.Double 41 =
  18. 18.Double 96 =
  19. 19.Half of 112 =
  20. 20.Half of 48 =
  21. 21.Double 88 =
  22. 22.Double 43 =
  23. 23.Double 97 =
  24. 24.Double 18 =
  25. 25.Half of 154 =
  26. 26.Double 63 =
  27. 27.Half of 46 =
  28. 28.Half of 104 =
  29. 29.Double 38 =
  30. 30.Half of 168 =
  31. 31.Double 59 =
  32. 32.Double 84 =
  33. 33.Double 22 =
  34. 34.Double 85 =
  35. 35.Double 34 =
  36. 36.Half of 180 =
  37. 37.Half of 72 =
  38. 38.Half of 132 =
  39. 39.Double 75 =
  40. 40.Double 71 =

Answer key

  1. 29
  2. 58
  3. 67
  4. 136
  5. 164
  6. 19
  7. 21
  8. 53
  9. 62
  10. 99
  11. 42
  12. 71
  13. 72
  14. 162
  15. 32
  16. 43
  17. 82
  18. 192
  19. 56
  20. 24
  21. 176
  22. 86
  23. 194
  24. 36
  25. 77
  26. 126
  27. 23
  28. 52
  29. 76
  30. 84
  31. 118
  32. 168
  33. 44
  34. 170
  35. 68
  36. 90
  37. 36
  38. 66
  39. 150
  40. 142

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