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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 479 · 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 88 =
  2. 2.Double 21 =
  3. 3.Double 92 =
  4. 4.Half of 40 =
  5. 5.Double 23 =
  6. 6.Double 31 =
  7. 7.Half of 78 =
  8. 8.Half of 48 =
  9. 9.Double 18 =
  10. 10.Double 24 =
  11. 11.Half of 156 =
  12. 12.Double 32 =
  13. 13.Half of 198 =
  14. 14.Double 65 =
  15. 15.Double 81 =
  16. 16.Double 29 =
  17. 17.Half of 184 =
  18. 18.Double 41 =
  19. 19.Double 62 =
  20. 20.Double 36 =
  21. 21.Double 28 =
  22. 22.Double 25 =
  23. 23.Half of 44 =
  24. 24.Half of 70 =
  25. 25.Half of 120 =
  26. 26.Half of 62 =
  27. 27.Half of 166 =
  28. 28.Half of 92 =
  29. 29.Half of 58 =
  30. 30.Half of 130 =
  31. 31.Half of 158 =
  32. 32.Double 54 =
  33. 33.Half of 144 =
  34. 34.Double 27 =
  35. 35.Double 67 =
  36. 36.Double 47 =
  37. 37.Half of 82 =
  38. 38.Double 51 =
  39. 39.Half of 176 =
  40. 40.Half of 106 =

Answer key

  1. 176
  2. 42
  3. 184
  4. 20
  5. 46
  6. 62
  7. 39
  8. 24
  9. 36
  10. 48
  11. 78
  12. 64
  13. 99
  14. 130
  15. 162
  16. 58
  17. 92
  18. 82
  19. 124
  20. 72
  21. 56
  22. 50
  23. 22
  24. 35
  25. 60
  26. 31
  27. 83
  28. 46
  29. 29
  30. 65
  31. 79
  32. 108
  33. 72
  34. 54
  35. 134
  36. 94
  37. 41
  38. 102
  39. 88
  40. 53

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