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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 762 · 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 82 =
  2. 2.Half of 144 =
  3. 3.Half of 100 =
  4. 4.Double 77 =
  5. 5.Double 29 =
  6. 6.Double 56 =
  7. 7.Half of 120 =
  8. 8.Double 67 =
  9. 9.Double 21 =
  10. 10.Double 22 =
  11. 11.Half of 94 =
  12. 12.Double 75 =
  13. 13.Double 53 =
  14. 14.Double 87 =
  15. 15.Double 36 =
  16. 16.Half of 54 =
  17. 17.Double 84 =
  18. 18.Double 41 =
  19. 19.Double 91 =
  20. 20.Double 71 =
  21. 21.Half of 184 =
  22. 22.Half of 156 =
  23. 23.Half of 112 =
  24. 24.Double 34 =
  25. 25.Half of 28 =
  26. 26.Double 72 =
  27. 27.Half of 104 =
  28. 28.Half of 38 =
  29. 29.Half of 148 =
  30. 30.Double 16 =
  31. 31.Half of 96 =
  32. 32.Double 59 =
  33. 33.Double 42 =
  34. 34.Half of 90 =
  35. 35.Half of 64 =
  36. 36.Half of 88 =
  37. 37.Half of 26 =
  38. 38.Double 38 =
  39. 39.Double 28 =
  40. 40.Half of 152 =

Answer key

  1. 164
  2. 72
  3. 50
  4. 154
  5. 58
  6. 112
  7. 60
  8. 134
  9. 42
  10. 44
  11. 47
  12. 150
  13. 106
  14. 174
  15. 72
  16. 27
  17. 168
  18. 82
  19. 182
  20. 142
  21. 92
  22. 78
  23. 56
  24. 68
  25. 14
  26. 144
  27. 52
  28. 19
  29. 74
  30. 32
  31. 48
  32. 118
  33. 84
  34. 45
  35. 32
  36. 44
  37. 13
  38. 76
  39. 56
  40. 76

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