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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 780 · 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 184 =
  2. 2.Double 19 =
  3. 3.Half of 154 =
  4. 4.Double 41 =
  5. 5.Double 82 =
  6. 6.Double 21 =
  7. 7.Double 16 =
  8. 8.Half of 144 =
  9. 9.Double 61 =
  10. 10.Half of 38 =
  11. 11.Double 62 =
  12. 12.Half of 62 =
  13. 13.Double 24 =
  14. 14.Half of 152 =
  15. 15.Double 29 =
  16. 16.Double 68 =
  17. 17.Half of 128 =
  18. 18.Double 79 =
  19. 19.Double 97 =
  20. 20.Half of 84 =
  21. 21.Half of 108 =
  22. 22.Half of 188 =
  23. 23.Double 53 =
  24. 24.Half of 98 =
  25. 25.Half of 68 =
  26. 26.Half of 88 =
  27. 27.Half of 96 =
  28. 28.Half of 158 =
  29. 29.Double 75 =
  30. 30.Double 39 =
  31. 31.Double 27 =
  32. 32.Double 65 =
  33. 33.Half of 28 =
  34. 34.Half of 26 =
  35. 35.Half of 74 =
  36. 36.Double 54 =
  37. 37.Half of 114 =
  38. 38.Double 45 =
  39. 39.Half of 182 =
  40. 40.Double 23 =

Answer key

  1. 92
  2. 38
  3. 77
  4. 82
  5. 164
  6. 42
  7. 32
  8. 72
  9. 122
  10. 19
  11. 124
  12. 31
  13. 48
  14. 76
  15. 58
  16. 136
  17. 64
  18. 158
  19. 194
  20. 42
  21. 54
  22. 94
  23. 106
  24. 49
  25. 34
  26. 44
  27. 48
  28. 79
  29. 150
  30. 78
  31. 54
  32. 130
  33. 14
  34. 13
  35. 37
  36. 108
  37. 57
  38. 90
  39. 91
  40. 46

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