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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 592 · 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 78 =
  2. 2.Half of 88 =
  3. 3.Half of 158 =
  4. 4.Double 24 =
  5. 5.Double 27 =
  6. 6.Half of 122 =
  7. 7.Half of 154 =
  8. 8.Half of 178 =
  9. 9.Double 31 =
  10. 10.Half of 32 =
  11. 11.Half of 46 =
  12. 12.Half of 60 =
  13. 13.Half of 112 =
  14. 14.Half of 64 =
  15. 15.Double 21 =
  16. 16.Double 95 =
  17. 17.Half of 110 =
  18. 18.Double 42 =
  19. 19.Double 36 =
  20. 20.Half of 148 =
  21. 21.Double 79 =
  22. 22.Double 93 =
  23. 23.Double 77 =
  24. 24.Half of 192 =
  25. 25.Half of 54 =
  26. 26.Double 41 =
  27. 27.Half of 196 =
  28. 28.Double 85 =
  29. 29.Double 82 =
  30. 30.Double 75 =
  31. 31.Half of 194 =
  32. 32.Double 46 =
  33. 33.Double 61 =
  34. 34.Half of 96 =
  35. 35.Double 57 =
  36. 36.Double 87 =
  37. 37.Half of 34 =
  38. 38.Half of 36 =
  39. 39.Half of 124 =
  40. 40.Double 43 =

Answer key

  1. 156
  2. 44
  3. 79
  4. 48
  5. 54
  6. 61
  7. 77
  8. 89
  9. 62
  10. 16
  11. 23
  12. 30
  13. 56
  14. 32
  15. 42
  16. 190
  17. 55
  18. 84
  19. 72
  20. 74
  21. 158
  22. 186
  23. 154
  24. 96
  25. 27
  26. 82
  27. 98
  28. 170
  29. 164
  30. 150
  31. 97
  32. 92
  33. 122
  34. 48
  35. 114
  36. 174
  37. 17
  38. 18
  39. 62
  40. 86

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