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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 469 · 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 78 =
  2. 2.Half of 42 =
  3. 3.Half of 182 =
  4. 4.Half of 136 =
  5. 5.Double 56 =
  6. 6.Double 27 =
  7. 7.Half of 122 =
  8. 8.Half of 186 =
  9. 9.Double 35 =
  10. 10.Half of 74 =
  11. 11.Half of 128 =
  12. 12.Half of 192 =
  13. 13.Double 19 =
  14. 14.Double 41 =
  15. 15.Double 52 =
  16. 16.Double 24 =
  17. 17.Half of 92 =
  18. 18.Double 71 =
  19. 19.Half of 194 =
  20. 20.Half of 116 =
  21. 21.Half of 78 =
  22. 22.Double 37 =
  23. 23.Half of 90 =
  24. 24.Double 62 =
  25. 25.Half of 54 =
  26. 26.Double 67 =
  27. 27.Half of 160 =
  28. 28.Half of 28 =
  29. 29.Half of 166 =
  30. 30.Double 31 =
  31. 31.Double 91 =
  32. 32.Double 65 =
  33. 33.Double 84 =
  34. 34.Half of 26 =
  35. 35.Half of 96 =
  36. 36.Half of 112 =
  37. 37.Double 33 =
  38. 38.Half of 100 =
  39. 39.Double 36 =
  40. 40.Double 72 =

Answer key

  1. 156
  2. 21
  3. 91
  4. 68
  5. 112
  6. 54
  7. 61
  8. 93
  9. 70
  10. 37
  11. 64
  12. 96
  13. 38
  14. 82
  15. 104
  16. 48
  17. 46
  18. 142
  19. 97
  20. 58
  21. 39
  22. 74
  23. 45
  24. 124
  25. 27
  26. 134
  27. 80
  28. 14
  29. 83
  30. 62
  31. 182
  32. 130
  33. 168
  34. 13
  35. 48
  36. 56
  37. 66
  38. 50
  39. 72
  40. 144

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