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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 820 · 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 196 =
  2. 2.Half of 132 =
  3. 3.Double 79 =
  4. 4.Double 77 =
  5. 5.Double 26 =
  6. 6.Half of 92 =
  7. 7.Double 43 =
  8. 8.Double 71 =
  9. 9.Half of 44 =
  10. 10.Half of 140 =
  11. 11.Double 83 =
  12. 12.Half of 26 =
  13. 13.Double 59 =
  14. 14.Half of 148 =
  15. 15.Half of 186 =
  16. 16.Double 32 =
  17. 17.Half of 86 =
  18. 18.Double 75 =
  19. 19.Half of 166 =
  20. 20.Half of 74 =
  21. 21.Half of 34 =
  22. 22.Half of 66 =
  23. 23.Half of 164 =
  24. 24.Double 74 =
  25. 25.Double 17 =
  26. 26.Double 23 =
  27. 27.Half of 150 =
  28. 28.Double 78 =
  29. 29.Double 22 =
  30. 30.Half of 42 =
  31. 31.Half of 108 =
  32. 32.Half of 106 =
  33. 33.Half of 70 =
  34. 34.Double 18 =
  35. 35.Double 61 =
  36. 36.Double 97 =
  37. 37.Double 52 =
  38. 38.Half of 62 =
  39. 39.Half of 88 =
  40. 40.Half of 126 =

Answer key

  1. 98
  2. 66
  3. 158
  4. 154
  5. 52
  6. 46
  7. 86
  8. 142
  9. 22
  10. 70
  11. 166
  12. 13
  13. 118
  14. 74
  15. 93
  16. 64
  17. 43
  18. 150
  19. 83
  20. 37
  21. 17
  22. 33
  23. 82
  24. 148
  25. 34
  26. 46
  27. 75
  28. 156
  29. 44
  30. 21
  31. 54
  32. 53
  33. 35
  34. 36
  35. 122
  36. 194
  37. 104
  38. 31
  39. 44
  40. 63

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