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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 699 · 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 83 =
  2. 2.Double 24 =
  3. 3.Half of 62 =
  4. 4.Half of 72 =
  5. 5.Double 29 =
  6. 6.Double 69 =
  7. 7.Half of 74 =
  8. 8.Double 41 =
  9. 9.Double 53 =
  10. 10.Double 82 =
  11. 11.Half of 50 =
  12. 12.Half of 176 =
  13. 13.Double 27 =
  14. 14.Double 51 =
  15. 15.Half of 78 =
  16. 16.Half of 102 =
  17. 17.Half of 92 =
  18. 18.Double 73 =
  19. 19.Half of 114 =
  20. 20.Double 35 =
  21. 21.Half of 194 =
  22. 22.Half of 192 =
  23. 23.Double 84 =
  24. 24.Double 21 =
  25. 25.Double 45 =
  26. 26.Double 48 =
  27. 27.Double 36 =
  28. 28.Half of 80 =
  29. 29.Half of 168 =
  30. 30.Half of 66 =
  31. 31.Double 88 =
  32. 32.Double 44 =
  33. 33.Half of 40 =
  34. 34.Half of 68 =
  35. 35.Half of 152 =
  36. 36.Half of 38 =
  37. 37.Half of 36 =
  38. 38.Half of 88 =
  39. 39.Half of 186 =
  40. 40.Half of 112 =

Answer key

  1. 166
  2. 48
  3. 31
  4. 36
  5. 58
  6. 138
  7. 37
  8. 82
  9. 106
  10. 164
  11. 25
  12. 88
  13. 54
  14. 102
  15. 39
  16. 51
  17. 46
  18. 146
  19. 57
  20. 70
  21. 97
  22. 96
  23. 168
  24. 42
  25. 90
  26. 96
  27. 72
  28. 40
  29. 84
  30. 33
  31. 176
  32. 88
  33. 20
  34. 34
  35. 76
  36. 19
  37. 18
  38. 44
  39. 93
  40. 56

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