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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 743 · 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 52 =
  2. 2.Half of 144 =
  3. 3.Half of 38 =
  4. 4.Half of 136 =
  5. 5.Double 89 =
  6. 6.Double 54 =
  7. 7.Double 57 =
  8. 8.Double 46 =
  9. 9.Double 59 =
  10. 10.Double 53 =
  11. 11.Double 22 =
  12. 12.Double 21 =
  13. 13.Double 84 =
  14. 14.Half of 42 =
  15. 15.Double 83 =
  16. 16.Half of 72 =
  17. 17.Half of 130 =
  18. 18.Double 45 =
  19. 19.Double 42 =
  20. 20.Half of 62 =
  21. 21.Half of 128 =
  22. 22.Double 86 =
  23. 23.Double 44 =
  24. 24.Double 77 =
  25. 25.Half of 112 =
  26. 26.Half of 32 =
  27. 27.Double 66 =
  28. 28.Double 81 =
  29. 29.Double 85 =
  30. 30.Double 61 =
  31. 31.Double 28 =
  32. 32.Half of 88 =
  33. 33.Half of 48 =
  34. 34.Half of 140 =
  35. 35.Half of 80 =
  36. 36.Double 39 =
  37. 37.Double 55 =
  38. 38.Half of 70 =
  39. 39.Half of 176 =
  40. 40.Half of 96 =

Answer key

  1. 104
  2. 72
  3. 19
  4. 68
  5. 178
  6. 108
  7. 114
  8. 92
  9. 118
  10. 106
  11. 44
  12. 42
  13. 168
  14. 21
  15. 166
  16. 36
  17. 65
  18. 90
  19. 84
  20. 31
  21. 64
  22. 172
  23. 88
  24. 154
  25. 56
  26. 16
  27. 132
  28. 162
  29. 170
  30. 122
  31. 56
  32. 44
  33. 24
  34. 70
  35. 40
  36. 78
  37. 110
  38. 35
  39. 88
  40. 48

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