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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 893 · 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 188 =
  2. 2.Half of 154 =
  3. 3.Double 39 =
  4. 4.Half of 78 =
  5. 5.Half of 110 =
  6. 6.Half of 74 =
  7. 7.Half of 124 =
  8. 8.Double 18 =
  9. 9.Double 47 =
  10. 10.Half of 94 =
  11. 11.Half of 68 =
  12. 12.Half of 82 =
  13. 13.Double 95 =
  14. 14.Half of 122 =
  15. 15.Double 42 =
  16. 16.Double 25 =
  17. 17.Half of 104 =
  18. 18.Double 94 =
  19. 19.Double 85 =
  20. 20.Half of 48 =
  21. 21.Double 91 =
  22. 22.Half of 168 =
  23. 23.Double 73 =
  24. 24.Double 77 =
  25. 25.Half of 140 =
  26. 26.Double 62 =
  27. 27.Double 43 =
  28. 28.Half of 40 =
  29. 29.Double 81 =
  30. 30.Double 35 =
  31. 31.Double 55 =
  32. 32.Double 84 =
  33. 33.Half of 50 =
  34. 34.Half of 76 =
  35. 35.Double 64 =
  36. 36.Half of 172 =
  37. 37.Half of 52 =
  38. 38.Half of 144 =
  39. 39.Half of 28 =
  40. 40.Double 75 =

Answer key

  1. 94
  2. 77
  3. 78
  4. 39
  5. 55
  6. 37
  7. 62
  8. 36
  9. 94
  10. 47
  11. 34
  12. 41
  13. 190
  14. 61
  15. 84
  16. 50
  17. 52
  18. 188
  19. 170
  20. 24
  21. 182
  22. 84
  23. 146
  24. 154
  25. 70
  26. 124
  27. 86
  28. 20
  29. 162
  30. 70
  31. 110
  32. 168
  33. 25
  34. 38
  35. 128
  36. 86
  37. 26
  38. 72
  39. 14
  40. 150

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