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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 434 · 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 108 =
  2. 2.Double 22 =
  3. 3.Half of 88 =
  4. 4.Double 67 =
  5. 5.Double 26 =
  6. 6.Half of 36 =
  7. 7.Half of 146 =
  8. 8.Half of 186 =
  9. 9.Half of 104 =
  10. 10.Half of 112 =
  11. 11.Half of 198 =
  12. 12.Half of 94 =
  13. 13.Double 97 =
  14. 14.Half of 42 =
  15. 15.Half of 54 =
  16. 16.Double 88 =
  17. 17.Double 17 =
  18. 18.Half of 82 =
  19. 19.Half of 66 =
  20. 20.Half of 176 =
  21. 21.Double 24 =
  22. 22.Half of 122 =
  23. 23.Double 99 =
  24. 24.Double 85 =
  25. 25.Half of 56 =
  26. 26.Half of 62 =
  27. 27.Double 38 =
  28. 28.Half of 118 =
  29. 29.Double 91 =
  30. 30.Double 66 =
  31. 31.Half of 106 =
  32. 32.Half of 48 =
  33. 33.Half of 178 =
  34. 34.Half of 162 =
  35. 35.Double 62 =
  36. 36.Double 48 =
  37. 37.Double 35 =
  38. 38.Double 61 =
  39. 39.Double 27 =
  40. 40.Half of 30 =

Answer key

  1. 54
  2. 44
  3. 44
  4. 134
  5. 52
  6. 18
  7. 73
  8. 93
  9. 52
  10. 56
  11. 99
  12. 47
  13. 194
  14. 21
  15. 27
  16. 176
  17. 34
  18. 41
  19. 33
  20. 88
  21. 48
  22. 61
  23. 198
  24. 170
  25. 28
  26. 31
  27. 76
  28. 59
  29. 182
  30. 132
  31. 53
  32. 24
  33. 89
  34. 81
  35. 124
  36. 96
  37. 70
  38. 122
  39. 54
  40. 15

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