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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 174 · 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 56 =
  2. 2.Half of 36 =
  3. 3.Double 19 =
  4. 4.Double 55 =
  5. 5.Half of 178 =
  6. 6.Half of 96 =
  7. 7.Double 37 =
  8. 8.Double 71 =
  9. 9.Half of 150 =
  10. 10.Half of 34 =
  11. 11.Half of 58 =
  12. 12.Half of 60 =
  13. 13.Double 31 =
  14. 14.Double 23 =
  15. 15.Half of 184 =
  16. 16.Half of 92 =
  17. 17.Double 85 =
  18. 18.Half of 80 =
  19. 19.Half of 174 =
  20. 20.Half of 138 =
  21. 21.Double 17 =
  22. 22.Double 77 =
  23. 23.Double 75 =
  24. 24.Half of 82 =
  25. 25.Double 59 =
  26. 26.Half of 44 =
  27. 27.Double 91 =
  28. 28.Double 39 =
  29. 29.Double 96 =
  30. 30.Double 32 =
  31. 31.Double 45 =
  32. 32.Double 43 =
  33. 33.Half of 50 =
  34. 34.Half of 70 =
  35. 35.Double 98 =
  36. 36.Double 33 =
  37. 37.Double 69 =
  38. 38.Half of 140 =
  39. 39.Half of 118 =
  40. 40.Double 61 =

Answer key

  1. 28
  2. 18
  3. 38
  4. 110
  5. 89
  6. 48
  7. 74
  8. 142
  9. 75
  10. 17
  11. 29
  12. 30
  13. 62
  14. 46
  15. 92
  16. 46
  17. 170
  18. 40
  19. 87
  20. 69
  21. 34
  22. 154
  23. 150
  24. 41
  25. 118
  26. 22
  27. 182
  28. 78
  29. 192
  30. 64
  31. 90
  32. 86
  33. 25
  34. 35
  35. 196
  36. 66
  37. 138
  38. 70
  39. 59
  40. 122

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