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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 705 · 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 51 =
  2. 2.Half of 44 =
  3. 3.Half of 62 =
  4. 4.Half of 40 =
  5. 5.Double 53 =
  6. 6.Double 81 =
  7. 7.Double 37 =
  8. 8.Double 87 =
  9. 9.Double 28 =
  10. 10.Double 41 =
  11. 11.Double 71 =
  12. 12.Double 85 =
  13. 13.Double 19 =
  14. 14.Double 17 =
  15. 15.Double 99 =
  16. 16.Half of 118 =
  17. 17.Half of 194 =
  18. 18.Double 82 =
  19. 19.Half of 54 =
  20. 20.Half of 48 =
  21. 21.Half of 192 =
  22. 22.Half of 128 =
  23. 23.Double 21 =
  24. 24.Half of 130 =
  25. 25.Half of 196 =
  26. 26.Half of 72 =
  27. 27.Half of 80 =
  28. 28.Half of 120 =
  29. 29.Double 77 =
  30. 30.Double 91 =
  31. 31.Half of 36 =
  32. 32.Half of 84 =
  33. 33.Half of 114 =
  34. 34.Double 24 =
  35. 35.Double 35 =
  36. 36.Half of 174 =
  37. 37.Double 23 =
  38. 38.Half of 116 =
  39. 39.Double 54 =
  40. 40.Double 93 =

Answer key

  1. 102
  2. 22
  3. 31
  4. 20
  5. 106
  6. 162
  7. 74
  8. 174
  9. 56
  10. 82
  11. 142
  12. 170
  13. 38
  14. 34
  15. 198
  16. 59
  17. 97
  18. 164
  19. 27
  20. 24
  21. 96
  22. 64
  23. 42
  24. 65
  25. 98
  26. 36
  27. 40
  28. 60
  29. 154
  30. 182
  31. 18
  32. 42
  33. 57
  34. 48
  35. 70
  36. 87
  37. 46
  38. 58
  39. 108
  40. 186

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