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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 460 · 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 35 =
  2. 2.Double 39 =
  3. 3.Double 71 =
  4. 4.Half of 86 =
  5. 5.Half of 174 =
  6. 6.Half of 82 =
  7. 7.Half of 92 =
  8. 8.Double 36 =
  9. 9.Double 41 =
  10. 10.Half of 176 =
  11. 11.Double 44 =
  12. 12.Half of 42 =
  13. 13.Double 21 =
  14. 14.Half of 98 =
  15. 15.Double 34 =
  16. 16.Half of 36 =
  17. 17.Double 49 =
  18. 18.Half of 58 =
  19. 19.Half of 78 =
  20. 20.Double 76 =
  21. 21.Double 89 =
  22. 22.Half of 168 =
  23. 23.Double 97 =
  24. 24.Double 84 =
  25. 25.Half of 26 =
  26. 26.Double 82 =
  27. 27.Double 25 =
  28. 28.Double 87 =
  29. 29.Double 64 =
  30. 30.Double 99 =
  31. 31.Double 74 =
  32. 32.Half of 166 =
  33. 33.Half of 122 =
  34. 34.Half of 126 =
  35. 35.Double 38 =
  36. 36.Double 26 =
  37. 37.Half of 32 =
  38. 38.Double 78 =
  39. 39.Half of 164 =
  40. 40.Half of 130 =

Answer key

  1. 70
  2. 78
  3. 142
  4. 43
  5. 87
  6. 41
  7. 46
  8. 72
  9. 82
  10. 88
  11. 88
  12. 21
  13. 42
  14. 49
  15. 68
  16. 18
  17. 98
  18. 29
  19. 39
  20. 152
  21. 178
  22. 84
  23. 194
  24. 168
  25. 13
  26. 164
  27. 50
  28. 174
  29. 128
  30. 198
  31. 148
  32. 83
  33. 61
  34. 63
  35. 76
  36. 52
  37. 16
  38. 156
  39. 82
  40. 65

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