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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 811 · 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 198 =
  2. 2.Half of 104 =
  3. 3.Double 29 =
  4. 4.Half of 42 =
  5. 5.Double 71 =
  6. 6.Double 55 =
  7. 7.Half of 102 =
  8. 8.Double 41 =
  9. 9.Double 61 =
  10. 10.Double 74 =
  11. 11.Double 96 =
  12. 12.Double 22 =
  13. 13.Double 23 =
  14. 14.Half of 132 =
  15. 15.Double 86 =
  16. 16.Double 21 =
  17. 17.Double 18 =
  18. 18.Double 67 =
  19. 19.Half of 90 =
  20. 20.Double 76 =
  21. 21.Half of 38 =
  22. 22.Double 47 =
  23. 23.Half of 146 =
  24. 24.Double 46 =
  25. 25.Double 26 =
  26. 26.Half of 134 =
  27. 27.Half of 182 =
  28. 28.Half of 94 =
  29. 29.Double 24 =
  30. 30.Double 17 =
  31. 31.Double 82 =
  32. 32.Half of 36 =
  33. 33.Double 77 =
  34. 34.Half of 82 =
  35. 35.Double 73 =
  36. 36.Half of 170 =
  37. 37.Half of 162 =
  38. 38.Half of 84 =
  39. 39.Half of 68 =
  40. 40.Double 87 =

Answer key

  1. 99
  2. 52
  3. 58
  4. 21
  5. 142
  6. 110
  7. 51
  8. 82
  9. 122
  10. 148
  11. 192
  12. 44
  13. 46
  14. 66
  15. 172
  16. 42
  17. 36
  18. 134
  19. 45
  20. 152
  21. 19
  22. 94
  23. 73
  24. 92
  25. 52
  26. 67
  27. 91
  28. 47
  29. 48
  30. 34
  31. 164
  32. 18
  33. 154
  34. 41
  35. 146
  36. 85
  37. 81
  38. 42
  39. 34
  40. 174

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