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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 863 · 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 31 =
  2. 2.Half of 108 =
  3. 3.Half of 38 =
  4. 4.Half of 122 =
  5. 5.Double 76 =
  6. 6.Double 79 =
  7. 7.Double 91 =
  8. 8.Half of 28 =
  9. 9.Double 92 =
  10. 10.Half of 140 =
  11. 11.Double 47 =
  12. 12.Double 42 =
  13. 13.Double 93 =
  14. 14.Double 22 =
  15. 15.Half of 192 =
  16. 16.Half of 142 =
  17. 17.Half of 188 =
  18. 18.Half of 128 =
  19. 19.Double 51 =
  20. 20.Double 37 =
  21. 21.Half of 52 =
  22. 22.Double 36 =
  23. 23.Double 57 =
  24. 24.Half of 152 =
  25. 25.Half of 30 =
  26. 26.Double 39 =
  27. 27.Half of 54 =
  28. 28.Half of 98 =
  29. 29.Double 21 =
  30. 30.Double 26 =
  31. 31.Double 95 =
  32. 32.Double 82 =
  33. 33.Half of 166 =
  34. 34.Half of 158 =
  35. 35.Half of 168 =
  36. 36.Half of 198 =
  37. 37.Double 96 =
  38. 38.Double 72 =
  39. 39.Half of 80 =
  40. 40.Half of 160 =

Answer key

  1. 62
  2. 54
  3. 19
  4. 61
  5. 152
  6. 158
  7. 182
  8. 14
  9. 184
  10. 70
  11. 94
  12. 84
  13. 186
  14. 44
  15. 96
  16. 71
  17. 94
  18. 64
  19. 102
  20. 74
  21. 26
  22. 72
  23. 114
  24. 76
  25. 15
  26. 78
  27. 27
  28. 49
  29. 42
  30. 52
  31. 190
  32. 164
  33. 83
  34. 79
  35. 84
  36. 99
  37. 192
  38. 144
  39. 40
  40. 80

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