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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 503 · 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 57 =
  2. 2.Double 49 =
  3. 3.Double 86 =
  4. 4.Half of 104 =
  5. 5.Half of 46 =
  6. 6.Double 45 =
  7. 7.Half of 166 =
  8. 8.Double 68 =
  9. 9.Half of 116 =
  10. 10.Double 61 =
  11. 11.Double 84 =
  12. 12.Double 29 =
  13. 13.Half of 180 =
  14. 14.Half of 136 =
  15. 15.Double 16 =
  16. 16.Half of 34 =
  17. 17.Half of 164 =
  18. 18.Double 94 =
  19. 19.Double 85 =
  20. 20.Half of 114 =
  21. 21.Double 17 =
  22. 22.Double 96 =
  23. 23.Double 31 =
  24. 24.Half of 98 =
  25. 25.Double 38 =
  26. 26.Half of 106 =
  27. 27.Half of 170 =
  28. 28.Half of 54 =
  29. 29.Half of 52 =
  30. 30.Double 42 =
  31. 31.Double 74 =
  32. 32.Double 21 =
  33. 33.Half of 90 =
  34. 34.Double 66 =
  35. 35.Half of 76 =
  36. 36.Half of 168 =
  37. 37.Double 48 =
  38. 38.Double 51 =
  39. 39.Half of 146 =
  40. 40.Half of 62 =

Answer key

  1. 114
  2. 98
  3. 172
  4. 52
  5. 23
  6. 90
  7. 83
  8. 136
  9. 58
  10. 122
  11. 168
  12. 58
  13. 90
  14. 68
  15. 32
  16. 17
  17. 82
  18. 188
  19. 170
  20. 57
  21. 34
  22. 192
  23. 62
  24. 49
  25. 76
  26. 53
  27. 85
  28. 27
  29. 26
  30. 84
  31. 148
  32. 42
  33. 45
  34. 132
  35. 38
  36. 84
  37. 96
  38. 102
  39. 73
  40. 31

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