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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 554 · 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 160 =
  2. 2.Half of 170 =
  3. 3.Double 68 =
  4. 4.Double 28 =
  5. 5.Half of 114 =
  6. 6.Half of 42 =
  7. 7.Double 43 =
  8. 8.Half of 76 =
  9. 9.Double 58 =
  10. 10.Half of 174 =
  11. 11.Double 62 =
  12. 12.Half of 66 =
  13. 13.Double 72 =
  14. 14.Double 56 =
  15. 15.Double 51 =
  16. 16.Half of 164 =
  17. 17.Double 19 =
  18. 18.Double 86 =
  19. 19.Double 34 =
  20. 20.Double 97 =
  21. 21.Double 25 =
  22. 22.Double 37 =
  23. 23.Half of 172 =
  24. 24.Half of 176 =
  25. 25.Double 61 =
  26. 26.Half of 132 =
  27. 27.Half of 122 =
  28. 28.Double 65 =
  29. 29.Double 81 =
  30. 30.Half of 168 =
  31. 31.Double 26 =
  32. 32.Half of 58 =
  33. 33.Double 47 =
  34. 34.Half of 126 =
  35. 35.Half of 84 =
  36. 36.Half of 120 =
  37. 37.Half of 178 =
  38. 38.Half of 108 =
  39. 39.Double 33 =
  40. 40.Half of 28 =

Answer key

  1. 80
  2. 85
  3. 136
  4. 56
  5. 57
  6. 21
  7. 86
  8. 38
  9. 116
  10. 87
  11. 124
  12. 33
  13. 144
  14. 112
  15. 102
  16. 82
  17. 38
  18. 172
  19. 68
  20. 194
  21. 50
  22. 74
  23. 86
  24. 88
  25. 122
  26. 66
  27. 61
  28. 130
  29. 162
  30. 84
  31. 52
  32. 29
  33. 94
  34. 63
  35. 42
  36. 60
  37. 89
  38. 54
  39. 66
  40. 14

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