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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 616 · 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 124 =
  2. 2.Double 77 =
  3. 3.Double 38 =
  4. 4.Half of 50 =
  5. 5.Double 61 =
  6. 6.Double 51 =
  7. 7.Double 97 =
  8. 8.Double 99 =
  9. 9.Half of 160 =
  10. 10.Double 36 =
  11. 11.Double 63 =
  12. 12.Double 81 =
  13. 13.Double 49 =
  14. 14.Double 91 =
  15. 15.Double 47 =
  16. 16.Double 84 =
  17. 17.Half of 152 =
  18. 18.Double 18 =
  19. 19.Half of 70 =
  20. 20.Half of 130 =
  21. 21.Double 86 =
  22. 22.Double 41 =
  23. 23.Double 56 =
  24. 24.Double 24 =
  25. 25.Half of 48 =
  26. 26.Half of 68 =
  27. 27.Double 95 =
  28. 28.Double 66 =
  29. 29.Half of 192 =
  30. 30.Double 39 =
  31. 31.Half of 86 =
  32. 32.Half of 172 =
  33. 33.Double 29 =
  34. 34.Double 89 =
  35. 35.Double 42 =
  36. 36.Double 92 =
  37. 37.Half of 74 =
  38. 38.Double 22 =
  39. 39.Double 48 =
  40. 40.Half of 154 =

Answer key

  1. 62
  2. 154
  3. 76
  4. 25
  5. 122
  6. 102
  7. 194
  8. 198
  9. 80
  10. 72
  11. 126
  12. 162
  13. 98
  14. 182
  15. 94
  16. 168
  17. 76
  18. 36
  19. 35
  20. 65
  21. 172
  22. 82
  23. 112
  24. 48
  25. 24
  26. 34
  27. 190
  28. 132
  29. 96
  30. 78
  31. 43
  32. 86
  33. 58
  34. 178
  35. 84
  36. 184
  37. 37
  38. 44
  39. 96
  40. 77

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