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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 300 · 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.Half of 128 =
  2. 2.Half of 94 =
  3. 3.Double 28 =
  4. 4.Half of 62 =
  5. 5.Half of 72 =
  6. 6.Half of 184 =
  7. 7.Half of 192 =
  8. 8.Double 91 =
  9. 9.Double 19 =
  10. 10.Double 29 =
  11. 11.Half of 70 =
  12. 12.Half of 78 =
  13. 13.Double 97 =
  14. 14.Half of 160 =
  15. 15.Half of 108 =
  16. 16.Double 68 =
  17. 17.Half of 92 =
  18. 18.Double 95 =
  19. 19.Half of 82 =
  20. 20.Double 37 =
  21. 21.Half of 26 =
  22. 22.Double 84 =
  23. 23.Double 86 =
  24. 24.Half of 198 =
  25. 25.Half of 174 =
  26. 26.Double 18 =
  27. 27.Double 17 =
  28. 28.Half of 178 =
  29. 29.Half of 156 =
  30. 30.Half of 34 =
  31. 31.Half of 194 =
  32. 32.Double 46 =
  33. 33.Double 75 =
  34. 34.Half of 102 =
  35. 35.Half of 186 =
  36. 36.Half of 170 =
  37. 37.Double 47 =
  38. 38.Double 81 =
  39. 39.Double 31 =
  40. 40.Half of 124 =

Answer key

  1. 64
  2. 47
  3. 56
  4. 31
  5. 36
  6. 92
  7. 96
  8. 182
  9. 38
  10. 58
  11. 35
  12. 39
  13. 194
  14. 80
  15. 54
  16. 136
  17. 46
  18. 190
  19. 41
  20. 74
  21. 13
  22. 168
  23. 172
  24. 99
  25. 87
  26. 36
  27. 34
  28. 89
  29. 78
  30. 17
  31. 97
  32. 92
  33. 150
  34. 51
  35. 93
  36. 85
  37. 94
  38. 162
  39. 62
  40. 62

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