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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 523 · 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 23 =
  2. 2.Double 99 =
  3. 3.Half of 96 =
  4. 4.Double 51 =
  5. 5.Half of 104 =
  6. 6.Half of 40 =
  7. 7.Double 98 =
  8. 8.Double 78 =
  9. 9.Double 43 =
  10. 10.Half of 56 =
  11. 11.Half of 66 =
  12. 12.Half of 38 =
  13. 13.Half of 108 =
  14. 14.Double 29 =
  15. 15.Half of 88 =
  16. 16.Half of 110 =
  17. 17.Double 31 =
  18. 18.Double 21 =
  19. 19.Half of 192 =
  20. 20.Double 79 =
  21. 21.Half of 172 =
  22. 22.Double 18 =
  23. 23.Double 22 =
  24. 24.Half of 182 =
  25. 25.Double 77 =
  26. 26.Half of 48 =
  27. 27.Half of 170 =
  28. 28.Half of 42 =
  29. 29.Half of 68 =
  30. 30.Half of 60 =
  31. 31.Double 46 =
  32. 32.Double 83 =
  33. 33.Double 71 =
  34. 34.Double 35 =
  35. 35.Double 69 =
  36. 36.Half of 54 =
  37. 37.Half of 180 =
  38. 38.Double 49 =
  39. 39.Half of 100 =
  40. 40.Half of 132 =

Answer key

  1. 46
  2. 198
  3. 48
  4. 102
  5. 52
  6. 20
  7. 196
  8. 156
  9. 86
  10. 28
  11. 33
  12. 19
  13. 54
  14. 58
  15. 44
  16. 55
  17. 62
  18. 42
  19. 96
  20. 158
  21. 86
  22. 36
  23. 44
  24. 91
  25. 154
  26. 24
  27. 85
  28. 21
  29. 34
  30. 30
  31. 92
  32. 166
  33. 142
  34. 70
  35. 138
  36. 27
  37. 90
  38. 98
  39. 50
  40. 66

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