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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 365 · 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 76 =
  2. 2.Half of 94 =
  3. 3.Double 46 =
  4. 4.Half of 44 =
  5. 5.Half of 68 =
  6. 6.Half of 80 =
  7. 7.Double 54 =
  8. 8.Half of 38 =
  9. 9.Double 31 =
  10. 10.Half of 84 =
  11. 11.Half of 28 =
  12. 12.Half of 82 =
  13. 13.Double 69 =
  14. 14.Double 89 =
  15. 15.Half of 52 =
  16. 16.Half of 172 =
  17. 17.Half of 48 =
  18. 18.Half of 62 =
  19. 19.Half of 136 =
  20. 20.Double 82 =
  21. 21.Double 88 =
  22. 22.Double 55 =
  23. 23.Double 93 =
  24. 24.Double 73 =
  25. 25.Half of 98 =
  26. 26.Double 81 =
  27. 27.Half of 162 =
  28. 28.Half of 160 =
  29. 29.Double 25 =
  30. 30.Double 68 =
  31. 31.Half of 140 =
  32. 32.Half of 132 =
  33. 33.Half of 66 =
  34. 34.Half of 104 =
  35. 35.Half of 170 =
  36. 36.Half of 178 =
  37. 37.Half of 102 =
  38. 38.Double 23 =
  39. 39.Double 39 =
  40. 40.Half of 92 =

Answer key

  1. 38
  2. 47
  3. 92
  4. 22
  5. 34
  6. 40
  7. 108
  8. 19
  9. 62
  10. 42
  11. 14
  12. 41
  13. 138
  14. 178
  15. 26
  16. 86
  17. 24
  18. 31
  19. 68
  20. 164
  21. 176
  22. 110
  23. 186
  24. 146
  25. 49
  26. 162
  27. 81
  28. 80
  29. 50
  30. 136
  31. 70
  32. 66
  33. 33
  34. 52
  35. 85
  36. 89
  37. 51
  38. 46
  39. 78
  40. 46

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