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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 537 · 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 72 =
  2. 2.Half of 34 =
  3. 3.Half of 74 =
  4. 4.Double 84 =
  5. 5.Half of 124 =
  6. 6.Double 65 =
  7. 7.Double 23 =
  8. 8.Double 95 =
  9. 9.Half of 60 =
  10. 10.Double 88 =
  11. 11.Half of 106 =
  12. 12.Double 24 =
  13. 13.Double 19 =
  14. 14.Double 41 =
  15. 15.Double 71 =
  16. 16.Double 22 =
  17. 17.Double 52 =
  18. 18.Double 86 =
  19. 19.Half of 42 =
  20. 20.Half of 156 =
  21. 21.Double 21 =
  22. 22.Double 97 =
  23. 23.Half of 136 =
  24. 24.Double 16 =
  25. 25.Double 76 =
  26. 26.Half of 184 =
  27. 27.Half of 90 =
  28. 28.Double 33 =
  29. 29.Half of 28 =
  30. 30.Half of 194 =
  31. 31.Half of 92 =
  32. 32.Double 98 =
  33. 33.Half of 160 =
  34. 34.Half of 118 =
  35. 35.Half of 108 =
  36. 36.Half of 40 =
  37. 37.Double 25 =
  38. 38.Half of 196 =
  39. 39.Half of 54 =
  40. 40.Double 75 =

Answer key

  1. 36
  2. 17
  3. 37
  4. 168
  5. 62
  6. 130
  7. 46
  8. 190
  9. 30
  10. 176
  11. 53
  12. 48
  13. 38
  14. 82
  15. 142
  16. 44
  17. 104
  18. 172
  19. 21
  20. 78
  21. 42
  22. 194
  23. 68
  24. 32
  25. 152
  26. 92
  27. 45
  28. 66
  29. 14
  30. 97
  31. 46
  32. 196
  33. 80
  34. 59
  35. 54
  36. 20
  37. 50
  38. 98
  39. 27
  40. 150

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