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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 703 · 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 21 =
  2. 2.Half of 70 =
  3. 3.Half of 196 =
  4. 4.Double 36 =
  5. 5.Double 19 =
  6. 6.Double 41 =
  7. 7.Half of 58 =
  8. 8.Half of 162 =
  9. 9.Double 49 =
  10. 10.Double 57 =
  11. 11.Half of 48 =
  12. 12.Double 92 =
  13. 13.Half of 176 =
  14. 14.Half of 90 =
  15. 15.Half of 26 =
  16. 16.Half of 190 =
  17. 17.Half of 88 =
  18. 18.Half of 150 =
  19. 19.Half of 38 =
  20. 20.Half of 50 =
  21. 21.Double 31 =
  22. 22.Double 77 =
  23. 23.Double 67 =
  24. 24.Double 33 =
  25. 25.Double 69 =
  26. 26.Double 51 =
  27. 27.Half of 52 =
  28. 28.Half of 84 =
  29. 29.Half of 166 =
  30. 30.Half of 92 =
  31. 31.Double 23 =
  32. 32.Half of 66 =
  33. 33.Double 79 =
  34. 34.Half of 140 =
  35. 35.Double 78 =
  36. 36.Half of 194 =
  37. 37.Half of 174 =
  38. 38.Half of 144 =
  39. 39.Double 35 =
  40. 40.Half of 34 =

Answer key

  1. 42
  2. 35
  3. 98
  4. 72
  5. 38
  6. 82
  7. 29
  8. 81
  9. 98
  10. 114
  11. 24
  12. 184
  13. 88
  14. 45
  15. 13
  16. 95
  17. 44
  18. 75
  19. 19
  20. 25
  21. 62
  22. 154
  23. 134
  24. 66
  25. 138
  26. 102
  27. 26
  28. 42
  29. 83
  30. 46
  31. 46
  32. 33
  33. 158
  34. 70
  35. 156
  36. 97
  37. 87
  38. 72
  39. 70
  40. 17

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