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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 704 · 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 67 =
  2. 2.Double 98 =
  3. 3.Double 68 =
  4. 4.Half of 54 =
  5. 5.Double 33 =
  6. 6.Double 45 =
  7. 7.Half of 48 =
  8. 8.Half of 120 =
  9. 9.Half of 138 =
  10. 10.Half of 192 =
  11. 11.Double 54 =
  12. 12.Half of 58 =
  13. 13.Half of 40 =
  14. 14.Double 94 =
  15. 15.Half of 178 =
  16. 16.Double 24 =
  17. 17.Double 31 =
  18. 18.Half of 30 =
  19. 19.Half of 72 =
  20. 20.Double 74 =
  21. 21.Double 19 =
  22. 22.Double 61 =
  23. 23.Half of 104 =
  24. 24.Half of 98 =
  25. 25.Double 43 =
  26. 26.Half of 156 =
  27. 27.Half of 60 =
  28. 28.Half of 142 =
  29. 29.Half of 62 =
  30. 30.Double 81 =
  31. 31.Double 18 =
  32. 32.Double 47 =
  33. 33.Half of 180 =
  34. 34.Double 23 =
  35. 35.Half of 164 =
  36. 36.Half of 170 =
  37. 37.Double 91 =
  38. 38.Half of 106 =
  39. 39.Double 41 =
  40. 40.Half of 96 =

Answer key

  1. 134
  2. 196
  3. 136
  4. 27
  5. 66
  6. 90
  7. 24
  8. 60
  9. 69
  10. 96
  11. 108
  12. 29
  13. 20
  14. 188
  15. 89
  16. 48
  17. 62
  18. 15
  19. 36
  20. 148
  21. 38
  22. 122
  23. 52
  24. 49
  25. 86
  26. 78
  27. 30
  28. 71
  29. 31
  30. 162
  31. 36
  32. 94
  33. 90
  34. 46
  35. 82
  36. 85
  37. 182
  38. 53
  39. 82
  40. 48

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