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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 368 · 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 92 =
  2. 2.Half of 104 =
  3. 3.Half of 96 =
  4. 4.Half of 34 =
  5. 5.Double 31 =
  6. 6.Double 81 =
  7. 7.Double 66 =
  8. 8.Double 79 =
  9. 9.Double 44 =
  10. 10.Double 55 =
  11. 11.Double 91 =
  12. 12.Double 53 =
  13. 13.Half of 198 =
  14. 14.Half of 100 =
  15. 15.Double 97 =
  16. 16.Half of 48 =
  17. 17.Half of 64 =
  18. 18.Half of 122 =
  19. 19.Double 38 =
  20. 20.Half of 174 =
  21. 21.Half of 194 =
  22. 22.Double 18 =
  23. 23.Half of 154 =
  24. 24.Double 46 =
  25. 25.Half of 46 =
  26. 26.Half of 58 =
  27. 27.Half of 114 =
  28. 28.Half of 192 =
  29. 29.Half of 110 =
  30. 30.Double 41 =
  31. 31.Half of 42 =
  32. 32.Double 88 =
  33. 33.Double 83 =
  34. 34.Half of 88 =
  35. 35.Half of 166 =
  36. 36.Double 24 =
  37. 37.Half of 36 =
  38. 38.Half of 30 =
  39. 39.Half of 186 =
  40. 40.Half of 120 =

Answer key

  1. 184
  2. 52
  3. 48
  4. 17
  5. 62
  6. 162
  7. 132
  8. 158
  9. 88
  10. 110
  11. 182
  12. 106
  13. 99
  14. 50
  15. 194
  16. 24
  17. 32
  18. 61
  19. 76
  20. 87
  21. 97
  22. 36
  23. 77
  24. 92
  25. 23
  26. 29
  27. 57
  28. 96
  29. 55
  30. 82
  31. 21
  32. 176
  33. 166
  34. 44
  35. 83
  36. 48
  37. 18
  38. 15
  39. 93
  40. 60

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