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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 182 · 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 170 =
  2. 2.Double 19 =
  3. 3.Double 79 =
  4. 4.Double 24 =
  5. 5.Double 66 =
  6. 6.Half of 144 =
  7. 7.Half of 36 =
  8. 8.Double 21 =
  9. 9.Half of 64 =
  10. 10.Half of 108 =
  11. 11.Double 85 =
  12. 12.Half of 128 =
  13. 13.Half of 56 =
  14. 14.Double 32 =
  15. 15.Half of 140 =
  16. 16.Half of 62 =
  17. 17.Double 23 =
  18. 18.Double 71 =
  19. 19.Double 18 =
  20. 20.Double 87 =
  21. 21.Double 39 =
  22. 22.Half of 40 =
  23. 23.Half of 148 =
  24. 24.Double 56 =
  25. 25.Half of 42 =
  26. 26.Double 36 =
  27. 27.Half of 152 =
  28. 28.Double 84 =
  29. 29.Double 17 =
  30. 30.Double 26 =
  31. 31.Double 75 =
  32. 32.Double 34 =
  33. 33.Double 69 =
  34. 34.Half of 182 =
  35. 35.Double 98 =
  36. 36.Half of 198 =
  37. 37.Double 68 =
  38. 38.Double 81 =
  39. 39.Double 61 =
  40. 40.Half of 178 =

Answer key

  1. 85
  2. 38
  3. 158
  4. 48
  5. 132
  6. 72
  7. 18
  8. 42
  9. 32
  10. 54
  11. 170
  12. 64
  13. 28
  14. 64
  15. 70
  16. 31
  17. 46
  18. 142
  19. 36
  20. 174
  21. 78
  22. 20
  23. 74
  24. 112
  25. 21
  26. 72
  27. 76
  28. 168
  29. 34
  30. 52
  31. 150
  32. 68
  33. 138
  34. 91
  35. 196
  36. 99
  37. 136
  38. 162
  39. 122
  40. 89

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