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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 685 · 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 86 =
  2. 2.Half of 176 =
  3. 3.Half of 168 =
  4. 4.Double 81 =
  5. 5.Double 39 =
  6. 6.Double 68 =
  7. 7.Half of 196 =
  8. 8.Double 91 =
  9. 9.Double 34 =
  10. 10.Half of 82 =
  11. 11.Half of 166 =
  12. 12.Double 18 =
  13. 13.Half of 92 =
  14. 14.Half of 36 =
  15. 15.Double 48 =
  16. 16.Double 75 =
  17. 17.Double 22 =
  18. 18.Double 96 =
  19. 19.Double 54 =
  20. 20.Half of 56 =
  21. 21.Double 85 =
  22. 22.Double 42 =
  23. 23.Double 73 =
  24. 24.Double 55 =
  25. 25.Half of 122 =
  26. 26.Double 31 =
  27. 27.Half of 170 =
  28. 28.Double 78 =
  29. 29.Double 36 =
  30. 30.Double 32 =
  31. 31.Double 25 =
  32. 32.Double 19 =
  33. 33.Half of 62 =
  34. 34.Half of 66 =
  35. 35.Half of 140 =
  36. 36.Half of 146 =
  37. 37.Half of 42 =
  38. 38.Double 35 =
  39. 39.Half of 178 =
  40. 40.Double 63 =

Answer key

  1. 43
  2. 88
  3. 84
  4. 162
  5. 78
  6. 136
  7. 98
  8. 182
  9. 68
  10. 41
  11. 83
  12. 36
  13. 46
  14. 18
  15. 96
  16. 150
  17. 44
  18. 192
  19. 108
  20. 28
  21. 170
  22. 84
  23. 146
  24. 110
  25. 61
  26. 62
  27. 85
  28. 156
  29. 72
  30. 64
  31. 50
  32. 38
  33. 31
  34. 33
  35. 70
  36. 73
  37. 21
  38. 70
  39. 89
  40. 126

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