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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 360 · 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 37 =
  2. 2.Half of 192 =
  3. 3.Double 22 =
  4. 4.Double 69 =
  5. 5.Double 19 =
  6. 6.Double 55 =
  7. 7.Double 58 =
  8. 8.Half of 156 =
  9. 9.Half of 168 =
  10. 10.Double 51 =
  11. 11.Double 77 =
  12. 12.Double 96 =
  13. 13.Half of 88 =
  14. 14.Half of 178 =
  15. 15.Half of 74 =
  16. 16.Half of 34 =
  17. 17.Double 35 =
  18. 18.Half of 40 =
  19. 19.Double 34 =
  20. 20.Double 48 =
  21. 21.Half of 110 =
  22. 22.Double 41 =
  23. 23.Double 71 =
  24. 24.Half of 68 =
  25. 25.Half of 76 =
  26. 26.Double 44 =
  27. 27.Half of 94 =
  28. 28.Double 61 =
  29. 29.Double 21 =
  30. 30.Double 29 =
  31. 31.Double 49 =
  32. 32.Half of 78 =
  33. 33.Half of 142 =
  34. 34.Half of 144 =
  35. 35.Half of 132 =
  36. 36.Double 63 =
  37. 37.Half of 138 =
  38. 38.Half of 194 =
  39. 39.Double 53 =
  40. 40.Double 83 =

Answer key

  1. 74
  2. 96
  3. 44
  4. 138
  5. 38
  6. 110
  7. 116
  8. 78
  9. 84
  10. 102
  11. 154
  12. 192
  13. 44
  14. 89
  15. 37
  16. 17
  17. 70
  18. 20
  19. 68
  20. 96
  21. 55
  22. 82
  23. 142
  24. 34
  25. 38
  26. 88
  27. 47
  28. 122
  29. 42
  30. 58
  31. 98
  32. 39
  33. 71
  34. 72
  35. 66
  36. 126
  37. 69
  38. 97
  39. 106
  40. 166

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