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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 527 · 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 41 =
  2. 2.Double 31 =
  3. 3.Half of 44 =
  4. 4.Double 82 =
  5. 5.Double 54 =
  6. 6.Double 78 =
  7. 7.Half of 26 =
  8. 8.Half of 52 =
  9. 9.Double 49 =
  10. 10.Half of 38 =
  11. 11.Half of 108 =
  12. 12.Double 16 =
  13. 13.Double 47 =
  14. 14.Half of 194 =
  15. 15.Double 76 =
  16. 16.Half of 28 =
  17. 17.Double 48 =
  18. 18.Half of 192 =
  19. 19.Double 44 =
  20. 20.Half of 66 =
  21. 21.Double 21 =
  22. 22.Half of 166 =
  23. 23.Double 81 =
  24. 24.Half of 180 =
  25. 25.Double 24 =
  26. 26.Double 43 =
  27. 27.Double 84 =
  28. 28.Half of 176 =
  29. 29.Half of 132 =
  30. 30.Half of 34 =
  31. 31.Half of 158 =
  32. 32.Double 87 =
  33. 33.Half of 110 =
  34. 34.Half of 70 =
  35. 35.Half of 144 =
  36. 36.Double 66 =
  37. 37.Half of 96 =
  38. 38.Half of 30 =
  39. 39.Half of 112 =
  40. 40.Half of 122 =

Answer key

  1. 82
  2. 62
  3. 22
  4. 164
  5. 108
  6. 156
  7. 13
  8. 26
  9. 98
  10. 19
  11. 54
  12. 32
  13. 94
  14. 97
  15. 152
  16. 14
  17. 96
  18. 96
  19. 88
  20. 33
  21. 42
  22. 83
  23. 162
  24. 90
  25. 48
  26. 86
  27. 168
  28. 88
  29. 66
  30. 17
  31. 79
  32. 174
  33. 55
  34. 35
  35. 72
  36. 132
  37. 48
  38. 15
  39. 56
  40. 61

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