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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 313 · 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 55 =
  2. 2.Double 44 =
  3. 3.Double 26 =
  4. 4.Half of 192 =
  5. 5.Double 75 =
  6. 6.Half of 188 =
  7. 7.Double 29 =
  8. 8.Double 43 =
  9. 9.Half of 166 =
  10. 10.Double 25 =
  11. 11.Double 41 =
  12. 12.Half of 136 =
  13. 13.Double 73 =
  14. 14.Half of 178 =
  15. 15.Double 31 =
  16. 16.Half of 162 =
  17. 17.Double 95 =
  18. 18.Half of 94 =
  19. 19.Double 23 =
  20. 20.Half of 196 =
  21. 21.Double 81 =
  22. 22.Half of 180 =
  23. 23.Double 59 =
  24. 24.Half of 80 =
  25. 25.Double 69 =
  26. 26.Double 21 =
  27. 27.Double 83 =
  28. 28.Double 54 =
  29. 29.Double 38 =
  30. 30.Double 53 =
  31. 31.Half of 144 =
  32. 32.Half of 58 =
  33. 33.Double 82 =
  34. 34.Double 37 =
  35. 35.Double 19 =
  36. 36.Double 46 =
  37. 37.Half of 52 =
  38. 38.Double 18 =
  39. 39.Half of 68 =
  40. 40.Half of 176 =

Answer key

  1. 110
  2. 88
  3. 52
  4. 96
  5. 150
  6. 94
  7. 58
  8. 86
  9. 83
  10. 50
  11. 82
  12. 68
  13. 146
  14. 89
  15. 62
  16. 81
  17. 190
  18. 47
  19. 46
  20. 98
  21. 162
  22. 90
  23. 118
  24. 40
  25. 138
  26. 42
  27. 166
  28. 108
  29. 76
  30. 106
  31. 72
  32. 29
  33. 164
  34. 74
  35. 38
  36. 92
  37. 26
  38. 36
  39. 34
  40. 88

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