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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 694 · 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 94 =
  2. 2.Half of 136 =
  3. 3.Half of 112 =
  4. 4.Half of 142 =
  5. 5.Half of 182 =
  6. 6.Half of 106 =
  7. 7.Double 21 =
  8. 8.Double 51 =
  9. 9.Double 29 =
  10. 10.Half of 86 =
  11. 11.Half of 80 =
  12. 12.Double 88 =
  13. 13.Half of 108 =
  14. 14.Half of 44 =
  15. 15.Half of 114 =
  16. 16.Double 24 =
  17. 17.Double 71 =
  18. 18.Double 91 =
  19. 19.Half of 102 =
  20. 20.Half of 96 =
  21. 21.Double 93 =
  22. 22.Double 59 =
  23. 23.Double 17 =
  24. 24.Half of 122 =
  25. 25.Half of 172 =
  26. 26.Half of 118 =
  27. 27.Double 16 =
  28. 28.Double 66 =
  29. 29.Half of 52 =
  30. 30.Half of 134 =
  31. 31.Half of 140 =
  32. 32.Double 28 =
  33. 33.Half of 28 =
  34. 34.Half of 42 =
  35. 35.Half of 76 =
  36. 36.Half of 188 =
  37. 37.Half of 98 =
  38. 38.Half of 180 =
  39. 39.Half of 184 =
  40. 40.Double 99 =

Answer key

  1. 47
  2. 68
  3. 56
  4. 71
  5. 91
  6. 53
  7. 42
  8. 102
  9. 58
  10. 43
  11. 40
  12. 176
  13. 54
  14. 22
  15. 57
  16. 48
  17. 142
  18. 182
  19. 51
  20. 48
  21. 186
  22. 118
  23. 34
  24. 61
  25. 86
  26. 59
  27. 32
  28. 132
  29. 26
  30. 67
  31. 70
  32. 56
  33. 14
  34. 21
  35. 38
  36. 94
  37. 49
  38. 90
  39. 92
  40. 198

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