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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 241 · 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 21 =
  2. 2.Half of 110 =
  3. 3.Double 45 =
  4. 4.Double 93 =
  5. 5.Half of 68 =
  6. 6.Half of 192 =
  7. 7.Double 31 =
  8. 8.Double 52 =
  9. 9.Half of 128 =
  10. 10.Half of 144 =
  11. 11.Half of 188 =
  12. 12.Half of 64 =
  13. 13.Double 35 =
  14. 14.Double 27 =
  15. 15.Half of 52 =
  16. 16.Double 75 =
  17. 17.Half of 130 =
  18. 18.Double 82 =
  19. 19.Double 51 =
  20. 20.Double 61 =
  21. 21.Half of 180 =
  22. 22.Half of 178 =
  23. 23.Half of 34 =
  24. 24.Double 23 =
  25. 25.Half of 40 =
  26. 26.Half of 118 =
  27. 27.Double 42 =
  28. 28.Half of 196 =
  29. 29.Half of 82 =
  30. 30.Double 57 =
  31. 31.Double 26 =
  32. 32.Half of 104 =
  33. 33.Double 34 =
  34. 34.Double 63 =
  35. 35.Half of 50 =
  36. 36.Half of 166 =
  37. 37.Half of 26 =
  38. 38.Double 47 =
  39. 39.Double 25 =
  40. 40.Double 96 =

Answer key

  1. 42
  2. 55
  3. 90
  4. 186
  5. 34
  6. 96
  7. 62
  8. 104
  9. 64
  10. 72
  11. 94
  12. 32
  13. 70
  14. 54
  15. 26
  16. 150
  17. 65
  18. 164
  19. 102
  20. 122
  21. 90
  22. 89
  23. 17
  24. 46
  25. 20
  26. 59
  27. 84
  28. 98
  29. 41
  30. 114
  31. 52
  32. 52
  33. 68
  34. 126
  35. 25
  36. 83
  37. 13
  38. 94
  39. 50
  40. 192

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