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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 706 · 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 18 =
  2. 2.Double 19 =
  3. 3.Double 41 =
  4. 4.Half of 84 =
  5. 5.Double 21 =
  6. 6.Half of 122 =
  7. 7.Half of 106 =
  8. 8.Half of 148 =
  9. 9.Half of 48 =
  10. 10.Half of 92 =
  11. 11.Double 79 =
  12. 12.Double 56 =
  13. 13.Half of 160 =
  14. 14.Half of 144 =
  15. 15.Double 23 =
  16. 16.Double 72 =
  17. 17.Half of 198 =
  18. 18.Double 71 =
  19. 19.Half of 76 =
  20. 20.Double 48 =
  21. 21.Double 32 =
  22. 22.Half of 172 =
  23. 23.Half of 196 =
  24. 24.Double 44 =
  25. 25.Double 61 =
  26. 26.Half of 80 =
  27. 27.Double 38 =
  28. 28.Half of 130 =
  29. 29.Double 85 =
  30. 30.Half of 62 =
  31. 31.Half of 56 =
  32. 32.Double 68 =
  33. 33.Double 31 =
  34. 34.Double 55 =
  35. 35.Half of 186 =
  36. 36.Half of 60 =
  37. 37.Double 53 =
  38. 38.Double 46 =
  39. 39.Double 74 =
  40. 40.Double 83 =

Answer key

  1. 36
  2. 38
  3. 82
  4. 42
  5. 42
  6. 61
  7. 53
  8. 74
  9. 24
  10. 46
  11. 158
  12. 112
  13. 80
  14. 72
  15. 46
  16. 144
  17. 99
  18. 142
  19. 38
  20. 96
  21. 64
  22. 86
  23. 98
  24. 88
  25. 122
  26. 40
  27. 76
  28. 65
  29. 170
  30. 31
  31. 28
  32. 136
  33. 62
  34. 110
  35. 93
  36. 30
  37. 106
  38. 92
  39. 148
  40. 166

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