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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 539 · 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 83 =
  2. 2.Half of 32 =
  3. 3.Half of 170 =
  4. 4.Double 56 =
  5. 5.Double 16 =
  6. 6.Half of 74 =
  7. 7.Double 46 =
  8. 8.Half of 72 =
  9. 9.Half of 196 =
  10. 10.Half of 186 =
  11. 11.Double 95 =
  12. 12.Half of 50 =
  13. 13.Double 25 =
  14. 14.Half of 36 =
  15. 15.Half of 80 =
  16. 16.Half of 82 =
  17. 17.Double 49 =
  18. 18.Double 23 =
  19. 19.Half of 154 =
  20. 20.Double 87 =
  21. 21.Double 86 =
  22. 22.Half of 78 =
  23. 23.Double 91 =
  24. 24.Half of 172 =
  25. 25.Double 62 =
  26. 26.Half of 116 =
  27. 27.Double 74 =
  28. 28.Double 88 =
  29. 29.Half of 144 =
  30. 30.Double 64 =
  31. 31.Double 43 =
  32. 32.Half of 54 =
  33. 33.Half of 92 =
  34. 34.Double 92 =
  35. 35.Half of 164 =
  36. 36.Double 76 =
  37. 37.Double 51 =
  38. 38.Half of 134 =
  39. 39.Half of 94 =
  40. 40.Half of 42 =

Answer key

  1. 166
  2. 16
  3. 85
  4. 112
  5. 32
  6. 37
  7. 92
  8. 36
  9. 98
  10. 93
  11. 190
  12. 25
  13. 50
  14. 18
  15. 40
  16. 41
  17. 98
  18. 46
  19. 77
  20. 174
  21. 172
  22. 39
  23. 182
  24. 86
  25. 124
  26. 58
  27. 148
  28. 176
  29. 72
  30. 128
  31. 86
  32. 27
  33. 46
  34. 184
  35. 82
  36. 152
  37. 102
  38. 67
  39. 47
  40. 21

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