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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 228 · 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 192 =
  2. 2.Half of 50 =
  3. 3.Double 48 =
  4. 4.Half of 184 =
  5. 5.Half of 42 =
  6. 6.Half of 166 =
  7. 7.Double 66 =
  8. 8.Double 67 =
  9. 9.Double 23 =
  10. 10.Double 37 =
  11. 11.Half of 134 =
  12. 12.Half of 98 =
  13. 13.Half of 186 =
  14. 14.Half of 160 =
  15. 15.Double 95 =
  16. 16.Half of 148 =
  17. 17.Double 49 =
  18. 18.Double 31 =
  19. 19.Half of 136 =
  20. 20.Half of 44 =
  21. 21.Double 85 =
  22. 22.Half of 58 =
  23. 23.Half of 52 =
  24. 24.Double 21 =
  25. 25.Half of 158 =
  26. 26.Half of 26 =
  27. 27.Double 46 =
  28. 28.Half of 196 =
  29. 29.Half of 48 =
  30. 30.Double 41 =
  31. 31.Half of 128 =
  32. 32.Double 47 =
  33. 33.Half of 74 =
  34. 34.Half of 86 =
  35. 35.Double 17 =
  36. 36.Double 71 =
  37. 37.Double 39 =
  38. 38.Half of 176 =
  39. 39.Double 45 =
  40. 40.Double 33 =

Answer key

  1. 96
  2. 25
  3. 96
  4. 92
  5. 21
  6. 83
  7. 132
  8. 134
  9. 46
  10. 74
  11. 67
  12. 49
  13. 93
  14. 80
  15. 190
  16. 74
  17. 98
  18. 62
  19. 68
  20. 22
  21. 170
  22. 29
  23. 26
  24. 42
  25. 79
  26. 13
  27. 92
  28. 98
  29. 24
  30. 82
  31. 64
  32. 94
  33. 37
  34. 43
  35. 34
  36. 142
  37. 78
  38. 88
  39. 90
  40. 66

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