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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 312 · 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.Double 92 =
  3. 3.Double 81 =
  4. 4.Double 39 =
  5. 5.Double 95 =
  6. 6.Double 84 =
  7. 7.Half of 124 =
  8. 8.Double 32 =
  9. 9.Half of 30 =
  10. 10.Double 83 =
  11. 11.Double 57 =
  12. 12.Half of 92 =
  13. 13.Half of 174 =
  14. 14.Double 65 =
  15. 15.Double 48 =
  16. 16.Half of 46 =
  17. 17.Half of 108 =
  18. 18.Half of 132 =
  19. 19.Double 18 =
  20. 20.Half of 90 =
  21. 21.Half of 62 =
  22. 22.Half of 192 =
  23. 23.Half of 64 =
  24. 24.Double 28 =
  25. 25.Double 31 =
  26. 26.Double 76 =
  27. 27.Double 99 =
  28. 28.Double 41 =
  29. 29.Half of 32 =
  30. 30.Double 16 =
  31. 31.Half of 128 =
  32. 32.Double 94 =
  33. 33.Double 42 =
  34. 34.Double 46 =
  35. 35.Double 29 =
  36. 36.Half of 38 =
  37. 37.Double 26 =
  38. 38.Half of 48 =
  39. 39.Double 72 =
  40. 40.Double 53 =

Answer key

  1. 156
  2. 184
  3. 162
  4. 78
  5. 190
  6. 168
  7. 62
  8. 64
  9. 15
  10. 166
  11. 114
  12. 46
  13. 87
  14. 130
  15. 96
  16. 23
  17. 54
  18. 66
  19. 36
  20. 45
  21. 31
  22. 96
  23. 32
  24. 56
  25. 62
  26. 152
  27. 198
  28. 82
  29. 16
  30. 32
  31. 64
  32. 188
  33. 84
  34. 92
  35. 58
  36. 19
  37. 52
  38. 24
  39. 144
  40. 106

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