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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 915 · 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 46 =
  2. 2.Double 92 =
  3. 3.Double 51 =
  4. 4.Half of 76 =
  5. 5.Half of 198 =
  6. 6.Double 29 =
  7. 7.Half of 128 =
  8. 8.Double 37 =
  9. 9.Double 25 =
  10. 10.Double 79 =
  11. 11.Half of 156 =
  12. 12.Half of 48 =
  13. 13.Double 63 =
  14. 14.Double 33 =
  15. 15.Double 77 =
  16. 16.Double 27 =
  17. 17.Half of 100 =
  18. 18.Half of 66 =
  19. 19.Half of 194 =
  20. 20.Double 87 =
  21. 21.Double 81 =
  22. 22.Double 21 =
  23. 23.Half of 188 =
  24. 24.Double 22 =
  25. 25.Half of 82 =
  26. 26.Half of 54 =
  27. 27.Half of 84 =
  28. 28.Half of 72 =
  29. 29.Half of 192 =
  30. 30.Double 26 =
  31. 31.Double 65 =
  32. 32.Double 49 =
  33. 33.Double 68 =
  34. 34.Half of 150 =
  35. 35.Half of 32 =
  36. 36.Double 55 =
  37. 37.Half of 140 =
  38. 38.Half of 108 =
  39. 39.Half of 112 =
  40. 40.Double 85 =

Answer key

  1. 23
  2. 184
  3. 102
  4. 38
  5. 99
  6. 58
  7. 64
  8. 74
  9. 50
  10. 158
  11. 78
  12. 24
  13. 126
  14. 66
  15. 154
  16. 54
  17. 50
  18. 33
  19. 97
  20. 174
  21. 162
  22. 42
  23. 94
  24. 44
  25. 41
  26. 27
  27. 42
  28. 36
  29. 96
  30. 52
  31. 130
  32. 98
  33. 136
  34. 75
  35. 16
  36. 110
  37. 70
  38. 54
  39. 56
  40. 170

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