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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 876 · 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 78 =
  2. 2.Double 33 =
  3. 3.Half of 70 =
  4. 4.Half of 114 =
  5. 5.Half of 72 =
  6. 6.Half of 180 =
  7. 7.Half of 48 =
  8. 8.Double 35 =
  9. 9.Half of 100 =
  10. 10.Double 78 =
  11. 11.Double 66 =
  12. 12.Half of 144 =
  13. 13.Double 94 =
  14. 14.Double 16 =
  15. 15.Double 39 =
  16. 16.Half of 50 =
  17. 17.Double 73 =
  18. 18.Double 64 =
  19. 19.Double 51 =
  20. 20.Double 21 =
  21. 21.Half of 38 =
  22. 22.Half of 172 =
  23. 23.Half of 110 =
  24. 24.Half of 118 =
  25. 25.Double 69 =
  26. 26.Double 31 =
  27. 27.Double 41 =
  28. 28.Half of 136 =
  29. 29.Double 18 =
  30. 30.Double 91 =
  31. 31.Double 86 =
  32. 32.Double 25 =
  33. 33.Half of 106 =
  34. 34.Double 71 =
  35. 35.Double 36 =
  36. 36.Half of 34 =
  37. 37.Half of 184 =
  38. 38.Double 95 =
  39. 39.Double 27 =
  40. 40.Half of 44 =

Answer key

  1. 39
  2. 66
  3. 35
  4. 57
  5. 36
  6. 90
  7. 24
  8. 70
  9. 50
  10. 156
  11. 132
  12. 72
  13. 188
  14. 32
  15. 78
  16. 25
  17. 146
  18. 128
  19. 102
  20. 42
  21. 19
  22. 86
  23. 55
  24. 59
  25. 138
  26. 62
  27. 82
  28. 68
  29. 36
  30. 182
  31. 172
  32. 50
  33. 53
  34. 142
  35. 72
  36. 17
  37. 92
  38. 190
  39. 54
  40. 22

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