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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 394 · 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 106 =
  2. 2.Double 23 =
  3. 3.Double 41 =
  4. 4.Double 49 =
  5. 5.Half of 34 =
  6. 6.Half of 102 =
  7. 7.Half of 56 =
  8. 8.Half of 26 =
  9. 9.Half of 62 =
  10. 10.Double 36 =
  11. 11.Double 45 =
  12. 12.Double 61 =
  13. 13.Half of 64 =
  14. 14.Double 69 =
  15. 15.Half of 32 =
  16. 16.Half of 60 =
  17. 17.Double 91 =
  18. 18.Half of 188 =
  19. 19.Double 59 =
  20. 20.Half of 52 =
  21. 21.Double 21 =
  22. 22.Double 39 =
  23. 23.Half of 122 =
  24. 24.Half of 96 =
  25. 25.Double 34 =
  26. 26.Double 81 =
  27. 27.Half of 38 =
  28. 28.Double 33 =
  29. 29.Half of 116 =
  30. 30.Double 88 =
  31. 31.Double 77 =
  32. 32.Double 68 =
  33. 33.Half of 124 =
  34. 34.Half of 94 =
  35. 35.Half of 80 =
  36. 36.Half of 110 =
  37. 37.Half of 198 =
  38. 38.Double 85 =
  39. 39.Half of 148 =
  40. 40.Double 19 =

Answer key

  1. 53
  2. 46
  3. 82
  4. 98
  5. 17
  6. 51
  7. 28
  8. 13
  9. 31
  10. 72
  11. 90
  12. 122
  13. 32
  14. 138
  15. 16
  16. 30
  17. 182
  18. 94
  19. 118
  20. 26
  21. 42
  22. 78
  23. 61
  24. 48
  25. 68
  26. 162
  27. 19
  28. 66
  29. 58
  30. 176
  31. 154
  32. 136
  33. 62
  34. 47
  35. 40
  36. 55
  37. 99
  38. 170
  39. 74
  40. 38

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