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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 246 · 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 174 =
  2. 2.Double 98 =
  3. 3.Double 22 =
  4. 4.Half of 104 =
  5. 5.Double 64 =
  6. 6.Double 69 =
  7. 7.Double 83 =
  8. 8.Double 55 =
  9. 9.Double 84 =
  10. 10.Double 38 =
  11. 11.Half of 164 =
  12. 12.Double 79 =
  13. 13.Half of 30 =
  14. 14.Double 82 =
  15. 15.Double 51 =
  16. 16.Half of 52 =
  17. 17.Half of 150 =
  18. 18.Double 62 =
  19. 19.Half of 142 =
  20. 20.Double 94 =
  21. 21.Double 57 =
  22. 22.Half of 122 =
  23. 23.Double 59 =
  24. 24.Double 19 =
  25. 25.Double 41 =
  26. 26.Half of 160 =
  27. 27.Half of 38 =
  28. 28.Double 77 =
  29. 29.Double 81 =
  30. 30.Double 93 =
  31. 31.Double 27 =
  32. 32.Double 65 =
  33. 33.Half of 82 =
  34. 34.Half of 98 =
  35. 35.Double 21 =
  36. 36.Double 36 =
  37. 37.Double 31 =
  38. 38.Double 26 =
  39. 39.Double 91 =
  40. 40.Double 18 =

Answer key

  1. 87
  2. 196
  3. 44
  4. 52
  5. 128
  6. 138
  7. 166
  8. 110
  9. 168
  10. 76
  11. 82
  12. 158
  13. 15
  14. 164
  15. 102
  16. 26
  17. 75
  18. 124
  19. 71
  20. 188
  21. 114
  22. 61
  23. 118
  24. 38
  25. 82
  26. 80
  27. 19
  28. 154
  29. 162
  30. 186
  31. 54
  32. 130
  33. 41
  34. 49
  35. 42
  36. 72
  37. 62
  38. 52
  39. 182
  40. 36

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