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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 898 · 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 72 =
  2. 2.Half of 64 =
  3. 3.Half of 32 =
  4. 4.Double 46 =
  5. 5.Half of 170 =
  6. 6.Half of 160 =
  7. 7.Double 51 =
  8. 8.Half of 96 =
  9. 9.Double 52 =
  10. 10.Half of 80 =
  11. 11.Double 58 =
  12. 12.Half of 162 =
  13. 13.Half of 46 =
  14. 14.Half of 182 =
  15. 15.Double 49 =
  16. 16.Double 16 =
  17. 17.Double 92 =
  18. 18.Half of 48 =
  19. 19.Double 31 =
  20. 20.Double 84 =
  21. 21.Half of 186 =
  22. 22.Double 33 =
  23. 23.Half of 144 =
  24. 24.Double 66 =
  25. 25.Half of 76 =
  26. 26.Double 19 =
  27. 27.Half of 108 =
  28. 28.Half of 86 =
  29. 29.Double 99 =
  30. 30.Half of 168 =
  31. 31.Double 96 =
  32. 32.Double 39 =
  33. 33.Double 24 =
  34. 34.Double 81 =
  35. 35.Half of 122 =
  36. 36.Half of 70 =
  37. 37.Double 54 =
  38. 38.Double 75 =
  39. 39.Half of 42 =
  40. 40.Half of 188 =

Answer key

  1. 36
  2. 32
  3. 16
  4. 92
  5. 85
  6. 80
  7. 102
  8. 48
  9. 104
  10. 40
  11. 116
  12. 81
  13. 23
  14. 91
  15. 98
  16. 32
  17. 184
  18. 24
  19. 62
  20. 168
  21. 93
  22. 66
  23. 72
  24. 132
  25. 38
  26. 38
  27. 54
  28. 43
  29. 198
  30. 84
  31. 192
  32. 78
  33. 48
  34. 162
  35. 61
  36. 35
  37. 108
  38. 150
  39. 21
  40. 94

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