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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 606 · 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 22 =
  2. 2.Double 61 =
  3. 3.Half of 78 =
  4. 4.Double 51 =
  5. 5.Half of 36 =
  6. 6.Double 45 =
  7. 7.Half of 162 =
  8. 8.Double 21 =
  9. 9.Half of 172 =
  10. 10.Half of 28 =
  11. 11.Double 41 =
  12. 12.Double 81 =
  13. 13.Half of 40 =
  14. 14.Half of 160 =
  15. 15.Double 31 =
  16. 16.Half of 54 =
  17. 17.Double 72 =
  18. 18.Half of 116 =
  19. 19.Double 79 =
  20. 20.Double 97 =
  21. 21.Half of 44 =
  22. 22.Half of 156 =
  23. 23.Double 85 =
  24. 24.Half of 138 =
  25. 25.Double 25 =
  26. 26.Half of 26 =
  27. 27.Double 55 =
  28. 28.Half of 42 =
  29. 29.Half of 150 =
  30. 30.Double 78 =
  31. 31.Half of 56 =
  32. 32.Half of 74 =
  33. 33.Double 99 =
  34. 34.Double 69 =
  35. 35.Double 48 =
  36. 36.Half of 92 =
  37. 37.Double 37 =
  38. 38.Double 35 =
  39. 39.Double 34 =
  40. 40.Half of 80 =

Answer key

  1. 44
  2. 122
  3. 39
  4. 102
  5. 18
  6. 90
  7. 81
  8. 42
  9. 86
  10. 14
  11. 82
  12. 162
  13. 20
  14. 80
  15. 62
  16. 27
  17. 144
  18. 58
  19. 158
  20. 194
  21. 22
  22. 78
  23. 170
  24. 69
  25. 50
  26. 13
  27. 110
  28. 21
  29. 75
  30. 156
  31. 28
  32. 37
  33. 198
  34. 138
  35. 96
  36. 46
  37. 74
  38. 70
  39. 68
  40. 40

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