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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 559 · 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 164 =
  2. 2.Half of 152 =
  3. 3.Half of 130 =
  4. 4.Double 72 =
  5. 5.Half of 172 =
  6. 6.Double 22 =
  7. 7.Half of 178 =
  8. 8.Double 42 =
  9. 9.Double 33 =
  10. 10.Double 31 =
  11. 11.Half of 114 =
  12. 12.Double 66 =
  13. 13.Double 58 =
  14. 14.Double 74 =
  15. 15.Half of 144 =
  16. 16.Half of 128 =
  17. 17.Double 53 =
  18. 18.Double 56 =
  19. 19.Half of 86 =
  20. 20.Half of 190 =
  21. 21.Half of 142 =
  22. 22.Half of 132 =
  23. 23.Half of 162 =
  24. 24.Double 47 =
  25. 25.Double 25 =
  26. 26.Half of 68 =
  27. 27.Half of 192 =
  28. 28.Half of 30 =
  29. 29.Double 95 =
  30. 30.Double 29 =
  31. 31.Double 81 =
  32. 32.Double 96 =
  33. 33.Half of 80 =
  34. 34.Half of 140 =
  35. 35.Double 48 =
  36. 36.Half of 104 =
  37. 37.Half of 46 =
  38. 38.Half of 28 =
  39. 39.Half of 90 =
  40. 40.Half of 54 =

Answer key

  1. 82
  2. 76
  3. 65
  4. 144
  5. 86
  6. 44
  7. 89
  8. 84
  9. 66
  10. 62
  11. 57
  12. 132
  13. 116
  14. 148
  15. 72
  16. 64
  17. 106
  18. 112
  19. 43
  20. 95
  21. 71
  22. 66
  23. 81
  24. 94
  25. 50
  26. 34
  27. 96
  28. 15
  29. 190
  30. 58
  31. 162
  32. 192
  33. 40
  34. 70
  35. 96
  36. 52
  37. 23
  38. 14
  39. 45
  40. 27

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