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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 327 · 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 96 =
  2. 2.Double 82 =
  3. 3.Double 18 =
  4. 4.Half of 170 =
  5. 5.Half of 52 =
  6. 6.Half of 38 =
  7. 7.Half of 192 =
  8. 8.Half of 154 =
  9. 9.Double 47 =
  10. 10.Double 73 =
  11. 11.Half of 28 =
  12. 12.Half of 180 =
  13. 13.Double 93 =
  14. 14.Half of 50 =
  15. 15.Double 37 =
  16. 16.Half of 58 =
  17. 17.Half of 78 =
  18. 18.Double 29 =
  19. 19.Double 94 =
  20. 20.Double 88 =
  21. 21.Half of 56 =
  22. 22.Double 75 =
  23. 23.Half of 176 =
  24. 24.Double 26 =
  25. 25.Double 51 =
  26. 26.Half of 116 =
  27. 27.Half of 80 =
  28. 28.Double 87 =
  29. 29.Half of 164 =
  30. 30.Half of 140 =
  31. 31.Double 95 =
  32. 32.Double 79 =
  33. 33.Double 43 =
  34. 34.Double 53 =
  35. 35.Double 68 =
  36. 36.Double 36 =
  37. 37.Half of 34 =
  38. 38.Half of 84 =
  39. 39.Half of 186 =
  40. 40.Double 86 =

Answer key

  1. 192
  2. 164
  3. 36
  4. 85
  5. 26
  6. 19
  7. 96
  8. 77
  9. 94
  10. 146
  11. 14
  12. 90
  13. 186
  14. 25
  15. 74
  16. 29
  17. 39
  18. 58
  19. 188
  20. 176
  21. 28
  22. 150
  23. 88
  24. 52
  25. 102
  26. 58
  27. 40
  28. 174
  29. 82
  30. 70
  31. 190
  32. 158
  33. 86
  34. 106
  35. 136
  36. 72
  37. 17
  38. 42
  39. 93
  40. 172

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