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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 609 · 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 46 =
  2. 2.Double 21 =
  3. 3.Half of 34 =
  4. 4.Double 88 =
  5. 5.Half of 100 =
  6. 6.Half of 80 =
  7. 7.Double 17 =
  8. 8.Double 67 =
  9. 9.Double 72 =
  10. 10.Half of 26 =
  11. 11.Double 61 =
  12. 12.Double 33 =
  13. 13.Half of 160 =
  14. 14.Half of 76 =
  15. 15.Double 41 =
  16. 16.Double 26 =
  17. 17.Half of 74 =
  18. 18.Double 31 =
  19. 19.Half of 188 =
  20. 20.Double 64 =
  21. 21.Double 16 =
  22. 22.Half of 88 =
  23. 23.Half of 168 =
  24. 24.Double 19 =
  25. 25.Double 74 =
  26. 26.Double 42 =
  27. 27.Half of 92 =
  28. 28.Half of 82 =
  29. 29.Half of 48 =
  30. 30.Double 52 =
  31. 31.Half of 118 =
  32. 32.Double 37 =
  33. 33.Half of 150 =
  34. 34.Half of 120 =
  35. 35.Half of 28 =
  36. 36.Double 36 =
  37. 37.Double 27 =
  38. 38.Double 95 =
  39. 39.Half of 174 =
  40. 40.Double 76 =

Answer key

  1. 23
  2. 42
  3. 17
  4. 176
  5. 50
  6. 40
  7. 34
  8. 134
  9. 144
  10. 13
  11. 122
  12. 66
  13. 80
  14. 38
  15. 82
  16. 52
  17. 37
  18. 62
  19. 94
  20. 128
  21. 32
  22. 44
  23. 84
  24. 38
  25. 148
  26. 84
  27. 46
  28. 41
  29. 24
  30. 104
  31. 59
  32. 74
  33. 75
  34. 60
  35. 14
  36. 72
  37. 54
  38. 190
  39. 87
  40. 152

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