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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 423 · 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 80 =
  2. 2.Half of 84 =
  3. 3.Half of 26 =
  4. 4.Half of 104 =
  5. 5.Half of 122 =
  6. 6.Double 61 =
  7. 7.Half of 86 =
  8. 8.Half of 114 =
  9. 9.Double 52 =
  10. 10.Double 42 =
  11. 11.Double 35 =
  12. 12.Half of 88 =
  13. 13.Half of 166 =
  14. 14.Half of 148 =
  15. 15.Double 43 =
  16. 16.Double 85 =
  17. 17.Double 91 =
  18. 18.Half of 28 =
  19. 19.Double 39 =
  20. 20.Half of 194 =
  21. 21.Half of 82 =
  22. 22.Double 67 =
  23. 23.Half of 92 =
  24. 24.Half of 38 =
  25. 25.Double 27 =
  26. 26.Double 38 =
  27. 27.Double 33 =
  28. 28.Half of 72 =
  29. 29.Double 95 =
  30. 30.Double 31 =
  31. 31.Half of 40 =
  32. 32.Double 87 =
  33. 33.Double 21 =
  34. 34.Double 59 =
  35. 35.Half of 34 =
  36. 36.Half of 196 =
  37. 37.Double 81 =
  38. 38.Half of 64 =
  39. 39.Half of 168 =
  40. 40.Double 63 =

Answer key

  1. 40
  2. 42
  3. 13
  4. 52
  5. 61
  6. 122
  7. 43
  8. 57
  9. 104
  10. 84
  11. 70
  12. 44
  13. 83
  14. 74
  15. 86
  16. 170
  17. 182
  18. 14
  19. 78
  20. 97
  21. 41
  22. 134
  23. 46
  24. 19
  25. 54
  26. 76
  27. 66
  28. 36
  29. 190
  30. 62
  31. 20
  32. 174
  33. 42
  34. 118
  35. 17
  36. 98
  37. 162
  38. 32
  39. 84
  40. 126

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