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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 914 · 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 186 =
  2. 2.Half of 140 =
  3. 3.Double 38 =
  4. 4.Half of 182 =
  5. 5.Half of 34 =
  6. 6.Half of 72 =
  7. 7.Double 43 =
  8. 8.Half of 130 =
  9. 9.Half of 40 =
  10. 10.Half of 192 =
  11. 11.Half of 118 =
  12. 12.Double 61 =
  13. 13.Double 36 =
  14. 14.Half of 152 =
  15. 15.Half of 136 =
  16. 16.Double 25 =
  17. 17.Double 37 =
  18. 18.Half of 82 =
  19. 19.Half of 162 =
  20. 20.Double 21 =
  21. 21.Double 49 =
  22. 22.Half of 60 =
  23. 23.Half of 190 =
  24. 24.Double 81 =
  25. 25.Double 88 =
  26. 26.Double 69 =
  27. 27.Double 58 =
  28. 28.Double 75 =
  29. 29.Half of 170 =
  30. 30.Half of 176 =
  31. 31.Double 78 =
  32. 32.Double 26 =
  33. 33.Double 51 =
  34. 34.Double 53 =
  35. 35.Half of 58 =
  36. 36.Double 74 =
  37. 37.Double 28 =
  38. 38.Half of 172 =
  39. 39.Half of 160 =
  40. 40.Double 32 =

Answer key

  1. 93
  2. 70
  3. 76
  4. 91
  5. 17
  6. 36
  7. 86
  8. 65
  9. 20
  10. 96
  11. 59
  12. 122
  13. 72
  14. 76
  15. 68
  16. 50
  17. 74
  18. 41
  19. 81
  20. 42
  21. 98
  22. 30
  23. 95
  24. 162
  25. 176
  26. 138
  27. 116
  28. 150
  29. 85
  30. 88
  31. 156
  32. 52
  33. 102
  34. 106
  35. 29
  36. 148
  37. 56
  38. 86
  39. 80
  40. 64

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