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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 338 · 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 58 =
  2. 2.Double 41 =
  3. 3.Half of 74 =
  4. 4.Half of 26 =
  5. 5.Double 89 =
  6. 6.Double 78 =
  7. 7.Double 17 =
  8. 8.Half of 140 =
  9. 9.Double 24 =
  10. 10.Half of 156 =
  11. 11.Half of 134 =
  12. 12.Double 37 =
  13. 13.Double 21 =
  14. 14.Half of 188 =
  15. 15.Double 75 =
  16. 16.Double 87 =
  17. 17.Double 56 =
  18. 18.Half of 98 =
  19. 19.Half of 146 =
  20. 20.Double 34 =
  21. 21.Double 66 =
  22. 22.Half of 142 =
  23. 23.Double 49 =
  24. 24.Half of 150 =
  25. 25.Half of 130 =
  26. 26.Double 16 =
  27. 27.Half of 48 =
  28. 28.Double 81 =
  29. 29.Double 19 =
  30. 30.Half of 88 =
  31. 31.Double 48 =
  32. 32.Double 27 =
  33. 33.Half of 148 =
  34. 34.Half of 78 =
  35. 35.Double 62 =
  36. 36.Half of 66 =
  37. 37.Half of 46 =
  38. 38.Double 63 =
  39. 39.Half of 82 =
  40. 40.Double 31 =

Answer key

  1. 29
  2. 82
  3. 37
  4. 13
  5. 178
  6. 156
  7. 34
  8. 70
  9. 48
  10. 78
  11. 67
  12. 74
  13. 42
  14. 94
  15. 150
  16. 174
  17. 112
  18. 49
  19. 73
  20. 68
  21. 132
  22. 71
  23. 98
  24. 75
  25. 65
  26. 32
  27. 24
  28. 162
  29. 38
  30. 44
  31. 96
  32. 54
  33. 74
  34. 39
  35. 124
  36. 33
  37. 23
  38. 126
  39. 41
  40. 62

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