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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 925 · 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 23 =
  2. 2.Double 26 =
  3. 3.Half of 86 =
  4. 4.Double 67 =
  5. 5.Half of 38 =
  6. 6.Double 77 =
  7. 7.Half of 186 =
  8. 8.Double 28 =
  9. 9.Half of 100 =
  10. 10.Half of 42 =
  11. 11.Half of 44 =
  12. 12.Half of 28 =
  13. 13.Half of 162 =
  14. 14.Half of 156 =
  15. 15.Double 19 =
  16. 16.Double 81 =
  17. 17.Half of 68 =
  18. 18.Half of 126 =
  19. 19.Half of 64 =
  20. 20.Half of 90 =
  21. 21.Double 73 =
  22. 22.Double 21 =
  23. 23.Double 39 =
  24. 24.Half of 134 =
  25. 25.Half of 120 =
  26. 26.Double 86 =
  27. 27.Half of 108 =
  28. 28.Half of 110 =
  29. 29.Half of 192 =
  30. 30.Half of 74 =
  31. 31.Double 64 =
  32. 32.Double 36 =
  33. 33.Double 18 =
  34. 34.Double 68 =
  35. 35.Half of 154 =
  36. 36.Half of 168 =
  37. 37.Half of 178 =
  38. 38.Half of 92 =
  39. 39.Double 85 =
  40. 40.Double 31 =

Answer key

  1. 46
  2. 52
  3. 43
  4. 134
  5. 19
  6. 154
  7. 93
  8. 56
  9. 50
  10. 21
  11. 22
  12. 14
  13. 81
  14. 78
  15. 38
  16. 162
  17. 34
  18. 63
  19. 32
  20. 45
  21. 146
  22. 42
  23. 78
  24. 67
  25. 60
  26. 172
  27. 54
  28. 55
  29. 96
  30. 37
  31. 128
  32. 72
  33. 36
  34. 136
  35. 77
  36. 84
  37. 89
  38. 46
  39. 170
  40. 62

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