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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 96 · 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 134 =
  2. 2.Double 75 =
  3. 3.Double 31 =
  4. 4.Double 59 =
  5. 5.Double 88 =
  6. 6.Double 49 =
  7. 7.Half of 112 =
  8. 8.Half of 76 =
  9. 9.Double 67 =
  10. 10.Double 84 =
  11. 11.Double 43 =
  12. 12.Half of 156 =
  13. 13.Half of 58 =
  14. 14.Half of 172 =
  15. 15.Double 27 =
  16. 16.Double 41 =
  17. 17.Double 66 =
  18. 18.Half of 94 =
  19. 19.Half of 68 =
  20. 20.Double 73 =
  21. 21.Half of 66 =
  22. 22.Double 51 =
  23. 23.Double 64 =
  24. 24.Double 21 =
  25. 25.Half of 100 =
  26. 26.Double 16 =
  27. 27.Half of 70 =
  28. 28.Double 93 =
  29. 29.Half of 26 =
  30. 30.Half of 124 =
  31. 31.Half of 140 =
  32. 32.Double 57 =
  33. 33.Double 58 =
  34. 34.Double 47 =
  35. 35.Double 94 =
  36. 36.Double 26 =
  37. 37.Double 95 =
  38. 38.Half of 116 =
  39. 39.Double 83 =
  40. 40.Double 69 =

Answer key

  1. 67
  2. 150
  3. 62
  4. 118
  5. 176
  6. 98
  7. 56
  8. 38
  9. 134
  10. 168
  11. 86
  12. 78
  13. 29
  14. 86
  15. 54
  16. 82
  17. 132
  18. 47
  19. 34
  20. 146
  21. 33
  22. 102
  23. 128
  24. 42
  25. 50
  26. 32
  27. 35
  28. 186
  29. 13
  30. 62
  31. 70
  32. 114
  33. 116
  34. 94
  35. 188
  36. 52
  37. 190
  38. 58
  39. 166
  40. 138

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