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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 618 · 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 81 =
  2. 2.Double 69 =
  3. 3.Half of 60 =
  4. 4.Double 19 =
  5. 5.Half of 100 =
  6. 6.Double 64 =
  7. 7.Double 39 =
  8. 8.Double 28 =
  9. 9.Double 55 =
  10. 10.Double 21 =
  11. 11.Double 86 =
  12. 12.Double 57 =
  13. 13.Double 17 =
  14. 14.Half of 32 =
  15. 15.Half of 68 =
  16. 16.Double 83 =
  17. 17.Double 29 =
  18. 18.Double 45 =
  19. 19.Double 73 =
  20. 20.Half of 50 =
  21. 21.Half of 48 =
  22. 22.Double 35 =
  23. 23.Double 74 =
  24. 24.Half of 70 =
  25. 25.Double 95 =
  26. 26.Half of 132 =
  27. 27.Double 38 =
  28. 28.Double 46 =
  29. 29.Double 31 =
  30. 30.Double 24 =
  31. 31.Double 44 =
  32. 32.Half of 46 =
  33. 33.Double 33 =
  34. 34.Double 63 =
  35. 35.Half of 92 =
  36. 36.Double 93 =
  37. 37.Half of 148 =
  38. 38.Double 89 =
  39. 39.Half of 96 =
  40. 40.Double 16 =

Answer key

  1. 162
  2. 138
  3. 30
  4. 38
  5. 50
  6. 128
  7. 78
  8. 56
  9. 110
  10. 42
  11. 172
  12. 114
  13. 34
  14. 16
  15. 34
  16. 166
  17. 58
  18. 90
  19. 146
  20. 25
  21. 24
  22. 70
  23. 148
  24. 35
  25. 190
  26. 66
  27. 76
  28. 92
  29. 62
  30. 48
  31. 88
  32. 23
  33. 66
  34. 126
  35. 46
  36. 186
  37. 74
  38. 178
  39. 48
  40. 32

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