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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 847 · 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 34 =
  2. 2.Double 61 =
  3. 3.Double 68 =
  4. 4.Half of 180 =
  5. 5.Double 81 =
  6. 6.Double 56 =
  7. 7.Half of 132 =
  8. 8.Half of 26 =
  9. 9.Double 88 =
  10. 10.Double 69 =
  11. 11.Double 29 =
  12. 12.Half of 66 =
  13. 13.Double 19 =
  14. 14.Double 49 =
  15. 15.Double 93 =
  16. 16.Double 83 =
  17. 17.Double 59 =
  18. 18.Double 87 =
  19. 19.Half of 98 =
  20. 20.Half of 190 =
  21. 21.Half of 178 =
  22. 22.Double 31 =
  23. 23.Double 17 =
  24. 24.Double 28 =
  25. 25.Half of 44 =
  26. 26.Double 84 =
  27. 27.Double 47 =
  28. 28.Half of 54 =
  29. 29.Double 62 =
  30. 30.Half of 120 =
  31. 31.Half of 36 =
  32. 32.Double 98 =
  33. 33.Half of 168 =
  34. 34.Double 78 =
  35. 35.Half of 184 =
  36. 36.Half of 82 =
  37. 37.Half of 170 =
  38. 38.Double 41 =
  39. 39.Double 77 =
  40. 40.Double 85 =

Answer key

  1. 68
  2. 122
  3. 136
  4. 90
  5. 162
  6. 112
  7. 66
  8. 13
  9. 176
  10. 138
  11. 58
  12. 33
  13. 38
  14. 98
  15. 186
  16. 166
  17. 118
  18. 174
  19. 49
  20. 95
  21. 89
  22. 62
  23. 34
  24. 56
  25. 22
  26. 168
  27. 94
  28. 27
  29. 124
  30. 60
  31. 18
  32. 196
  33. 84
  34. 156
  35. 92
  36. 41
  37. 85
  38. 82
  39. 154
  40. 170

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