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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 472 · 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 140 =
  2. 2.Double 28 =
  3. 3.Half of 142 =
  4. 4.Double 72 =
  5. 5.Half of 156 =
  6. 6.Double 35 =
  7. 7.Double 41 =
  8. 8.Double 29 =
  9. 9.Double 31 =
  10. 10.Half of 68 =
  11. 11.Double 61 =
  12. 12.Double 36 =
  13. 13.Half of 120 =
  14. 14.Half of 100 =
  15. 15.Double 82 =
  16. 16.Half of 160 =
  17. 17.Double 66 =
  18. 18.Half of 116 =
  19. 19.Double 69 =
  20. 20.Half of 108 =
  21. 21.Double 81 =
  22. 22.Double 92 =
  23. 23.Double 38 =
  24. 24.Half of 182 =
  25. 25.Double 27 =
  26. 26.Double 21 =
  27. 27.Double 76 =
  28. 28.Half of 30 =
  29. 29.Double 58 =
  30. 30.Double 55 =
  31. 31.Half of 170 =
  32. 32.Half of 60 =
  33. 33.Half of 190 =
  34. 34.Double 48 =
  35. 35.Double 64 =
  36. 36.Half of 96 =
  37. 37.Double 68 =
  38. 38.Half of 36 =
  39. 39.Half of 40 =
  40. 40.Half of 194 =

Answer key

  1. 70
  2. 56
  3. 71
  4. 144
  5. 78
  6. 70
  7. 82
  8. 58
  9. 62
  10. 34
  11. 122
  12. 72
  13. 60
  14. 50
  15. 164
  16. 80
  17. 132
  18. 58
  19. 138
  20. 54
  21. 162
  22. 184
  23. 76
  24. 91
  25. 54
  26. 42
  27. 152
  28. 15
  29. 116
  30. 110
  31. 85
  32. 30
  33. 95
  34. 96
  35. 128
  36. 48
  37. 136
  38. 18
  39. 20
  40. 97

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