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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 363 · 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 144 =
  2. 2.Double 43 =
  3. 3.Half of 30 =
  4. 4.Double 93 =
  5. 5.Half of 70 =
  6. 6.Half of 154 =
  7. 7.Double 38 =
  8. 8.Half of 82 =
  9. 9.Half of 136 =
  10. 10.Double 46 =
  11. 11.Double 86 =
  12. 12.Double 69 =
  13. 13.Half of 158 =
  14. 14.Double 33 =
  15. 15.Half of 90 =
  16. 16.Double 96 =
  17. 17.Half of 86 =
  18. 18.Double 51 =
  19. 19.Double 72 =
  20. 20.Double 36 =
  21. 21.Double 78 =
  22. 22.Half of 108 =
  23. 23.Double 17 =
  24. 24.Double 47 =
  25. 25.Half of 102 =
  26. 26.Half of 160 =
  27. 27.Half of 60 =
  28. 28.Double 41 =
  29. 29.Half of 48 =
  30. 30.Half of 84 =
  31. 31.Half of 78 =
  32. 32.Half of 104 =
  33. 33.Half of 198 =
  34. 34.Double 25 =
  35. 35.Double 85 =
  36. 36.Half of 176 =
  37. 37.Double 22 =
  38. 38.Half of 140 =
  39. 39.Half of 46 =
  40. 40.Half of 190 =

Answer key

  1. 72
  2. 86
  3. 15
  4. 186
  5. 35
  6. 77
  7. 76
  8. 41
  9. 68
  10. 92
  11. 172
  12. 138
  13. 79
  14. 66
  15. 45
  16. 192
  17. 43
  18. 102
  19. 144
  20. 72
  21. 156
  22. 54
  23. 34
  24. 94
  25. 51
  26. 80
  27. 30
  28. 82
  29. 24
  30. 42
  31. 39
  32. 52
  33. 99
  34. 50
  35. 170
  36. 88
  37. 44
  38. 70
  39. 23
  40. 95

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