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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 154 · 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 56 =
  2. 2.Half of 78 =
  3. 3.Double 36 =
  4. 4.Double 23 =
  5. 5.Double 81 =
  6. 6.Double 41 =
  7. 7.Double 28 =
  8. 8.Half of 160 =
  9. 9.Half of 172 =
  10. 10.Double 44 =
  11. 11.Half of 156 =
  12. 12.Double 39 =
  13. 13.Double 54 =
  14. 14.Double 98 =
  15. 15.Half of 180 =
  16. 16.Double 78 =
  17. 17.Double 62 =
  18. 18.Double 31 =
  19. 19.Double 25 =
  20. 20.Double 26 =
  21. 21.Half of 148 =
  22. 22.Double 17 =
  23. 23.Double 49 =
  24. 24.Double 35 =
  25. 25.Double 33 =
  26. 26.Half of 74 =
  27. 27.Double 29 =
  28. 28.Double 76 =
  29. 29.Double 58 =
  30. 30.Double 71 =
  31. 31.Half of 84 =
  32. 32.Half of 60 =
  33. 33.Double 22 =
  34. 34.Half of 194 =
  35. 35.Half of 58 =
  36. 36.Double 34 =
  37. 37.Double 86 =
  38. 38.Double 38 =
  39. 39.Double 88 =
  40. 40.Half of 88 =

Answer key

  1. 112
  2. 39
  3. 72
  4. 46
  5. 162
  6. 82
  7. 56
  8. 80
  9. 86
  10. 88
  11. 78
  12. 78
  13. 108
  14. 196
  15. 90
  16. 156
  17. 124
  18. 62
  19. 50
  20. 52
  21. 74
  22. 34
  23. 98
  24. 70
  25. 66
  26. 37
  27. 58
  28. 152
  29. 116
  30. 142
  31. 42
  32. 30
  33. 44
  34. 97
  35. 29
  36. 68
  37. 172
  38. 76
  39. 176
  40. 44

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