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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 992 · 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 182 =
  2. 2.Half of 30 =
  3. 3.Half of 82 =
  4. 4.Half of 54 =
  5. 5.Double 59 =
  6. 6.Half of 158 =
  7. 7.Double 25 =
  8. 8.Half of 92 =
  9. 9.Half of 42 =
  10. 10.Double 24 =
  11. 11.Double 42 =
  12. 12.Double 58 =
  13. 13.Half of 134 =
  14. 14.Double 61 =
  15. 15.Half of 70 =
  16. 16.Half of 116 =
  17. 17.Half of 168 =
  18. 18.Double 88 =
  19. 19.Double 39 =
  20. 20.Double 92 =
  21. 21.Half of 148 =
  22. 22.Half of 170 =
  23. 23.Double 17 =
  24. 24.Double 45 =
  25. 25.Double 91 =
  26. 26.Half of 96 =
  27. 27.Half of 186 =
  28. 28.Half of 172 =
  29. 29.Double 79 =
  30. 30.Half of 196 =
  31. 31.Half of 128 =
  32. 32.Half of 36 =
  33. 33.Half of 112 =
  34. 34.Half of 188 =
  35. 35.Half of 32 =
  36. 36.Double 37 =
  37. 37.Half of 142 =
  38. 38.Double 54 =
  39. 39.Half of 160 =
  40. 40.Half of 34 =

Answer key

  1. 91
  2. 15
  3. 41
  4. 27
  5. 118
  6. 79
  7. 50
  8. 46
  9. 21
  10. 48
  11. 84
  12. 116
  13. 67
  14. 122
  15. 35
  16. 58
  17. 84
  18. 176
  19. 78
  20. 184
  21. 74
  22. 85
  23. 34
  24. 90
  25. 182
  26. 48
  27. 93
  28. 86
  29. 158
  30. 98
  31. 64
  32. 18
  33. 56
  34. 94
  35. 16
  36. 74
  37. 71
  38. 108
  39. 80
  40. 17

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