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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 121 · 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 51 =
  2. 2.Half of 140 =
  3. 3.Half of 120 =
  4. 4.Double 63 =
  5. 5.Half of 188 =
  6. 6.Double 19 =
  7. 7.Half of 80 =
  8. 8.Half of 74 =
  9. 9.Double 37 =
  10. 10.Half of 104 =
  11. 11.Double 22 =
  12. 12.Half of 144 =
  13. 13.Half of 50 =
  14. 14.Half of 130 =
  15. 15.Double 62 =
  16. 16.Half of 64 =
  17. 17.Half of 86 =
  18. 18.Double 55 =
  19. 19.Double 67 =
  20. 20.Double 21 =
  21. 21.Double 34 =
  22. 22.Half of 184 =
  23. 23.Half of 136 =
  24. 24.Double 39 =
  25. 25.Double 53 =
  26. 26.Double 83 =
  27. 27.Half of 154 =
  28. 28.Half of 190 =
  29. 29.Half of 132 =
  30. 30.Half of 114 =
  31. 31.Double 38 =
  32. 32.Double 99 =
  33. 33.Double 56 =
  34. 34.Half of 194 =
  35. 35.Double 17 =
  36. 36.Double 27 =
  37. 37.Double 64 =
  38. 38.Half of 160 =
  39. 39.Half of 60 =
  40. 40.Half of 30 =

Answer key

  1. 102
  2. 70
  3. 60
  4. 126
  5. 94
  6. 38
  7. 40
  8. 37
  9. 74
  10. 52
  11. 44
  12. 72
  13. 25
  14. 65
  15. 124
  16. 32
  17. 43
  18. 110
  19. 134
  20. 42
  21. 68
  22. 92
  23. 68
  24. 78
  25. 106
  26. 166
  27. 77
  28. 95
  29. 66
  30. 57
  31. 76
  32. 198
  33. 112
  34. 97
  35. 34
  36. 54
  37. 128
  38. 80
  39. 30
  40. 15

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