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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 410 · 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 82 =
  2. 2.Half of 172 =
  3. 3.Double 17 =
  4. 4.Half of 164 =
  5. 5.Double 98 =
  6. 6.Double 18 =
  7. 7.Double 51 =
  8. 8.Double 33 =
  9. 9.Double 53 =
  10. 10.Half of 190 =
  11. 11.Half of 110 =
  12. 12.Double 87 =
  13. 13.Half of 182 =
  14. 14.Double 61 =
  15. 15.Double 72 =
  16. 16.Double 42 =
  17. 17.Half of 98 =
  18. 18.Half of 146 =
  19. 19.Double 94 =
  20. 20.Half of 184 =
  21. 21.Double 91 =
  22. 22.Half of 68 =
  23. 23.Double 57 =
  24. 24.Double 26 =
  25. 25.Double 49 =
  26. 26.Double 81 =
  27. 27.Double 54 =
  28. 28.Double 38 =
  29. 29.Double 85 =
  30. 30.Double 92 =
  31. 31.Double 97 =
  32. 32.Half of 96 =
  33. 33.Half of 44 =
  34. 34.Half of 192 =
  35. 35.Half of 170 =
  36. 36.Half of 124 =
  37. 37.Double 79 =
  38. 38.Half of 116 =
  39. 39.Double 21 =
  40. 40.Half of 114 =

Answer key

  1. 41
  2. 86
  3. 34
  4. 82
  5. 196
  6. 36
  7. 102
  8. 66
  9. 106
  10. 95
  11. 55
  12. 174
  13. 91
  14. 122
  15. 144
  16. 84
  17. 49
  18. 73
  19. 188
  20. 92
  21. 182
  22. 34
  23. 114
  24. 52
  25. 98
  26. 162
  27. 108
  28. 76
  29. 170
  30. 184
  31. 194
  32. 48
  33. 22
  34. 96
  35. 85
  36. 62
  37. 158
  38. 58
  39. 42
  40. 57

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