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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 48 · 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 154 =
  2. 2.Half of 32 =
  3. 3.Half of 142 =
  4. 4.Double 21 =
  5. 5.Double 32 =
  6. 6.Half of 66 =
  7. 7.Double 98 =
  8. 8.Half of 52 =
  9. 9.Double 97 =
  10. 10.Half of 58 =
  11. 11.Half of 108 =
  12. 12.Half of 178 =
  13. 13.Half of 116 =
  14. 14.Half of 56 =
  15. 15.Double 48 =
  16. 16.Double 89 =
  17. 17.Double 25 =
  18. 18.Double 96 =
  19. 19.Double 29 =
  20. 20.Half of 42 =
  21. 21.Half of 168 =
  22. 22.Half of 190 =
  23. 23.Double 47 =
  24. 24.Half of 80 =
  25. 25.Double 57 =
  26. 26.Half of 180 =
  27. 27.Half of 38 =
  28. 28.Double 62 =
  29. 29.Double 61 =
  30. 30.Half of 138 =
  31. 31.Double 92 =
  32. 32.Double 65 =
  33. 33.Double 55 =
  34. 34.Half of 28 =
  35. 35.Double 22 =
  36. 36.Double 58 =
  37. 37.Half of 136 =
  38. 38.Half of 74 =
  39. 39.Half of 30 =
  40. 40.Half of 84 =

Answer key

  1. 77
  2. 16
  3. 71
  4. 42
  5. 64
  6. 33
  7. 196
  8. 26
  9. 194
  10. 29
  11. 54
  12. 89
  13. 58
  14. 28
  15. 96
  16. 178
  17. 50
  18. 192
  19. 58
  20. 21
  21. 84
  22. 95
  23. 94
  24. 40
  25. 114
  26. 90
  27. 19
  28. 124
  29. 122
  30. 69
  31. 184
  32. 130
  33. 110
  34. 14
  35. 44
  36. 116
  37. 68
  38. 37
  39. 15
  40. 42

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