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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 662 · 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 154 =
  2. 2.Half of 72 =
  3. 3.Half of 196 =
  4. 4.Half of 92 =
  5. 5.Double 61 =
  6. 6.Half of 98 =
  7. 7.Double 26 =
  8. 8.Double 88 =
  9. 9.Half of 132 =
  10. 10.Half of 28 =
  11. 11.Half of 104 =
  12. 12.Half of 134 =
  13. 13.Half of 80 =
  14. 14.Double 18 =
  15. 15.Half of 168 =
  16. 16.Half of 66 =
  17. 17.Double 54 =
  18. 18.Half of 50 =
  19. 19.Double 39 =
  20. 20.Double 95 =
  21. 21.Half of 106 =
  22. 22.Double 78 =
  23. 23.Double 37 =
  24. 24.Half of 38 =
  25. 25.Half of 94 =
  26. 26.Double 28 =
  27. 27.Half of 86 =
  28. 28.Double 46 =
  29. 29.Half of 68 =
  30. 30.Half of 176 =
  31. 31.Double 65 =
  32. 32.Double 98 =
  33. 33.Double 75 =
  34. 34.Double 25 =
  35. 35.Half of 48 =
  36. 36.Double 58 =
  37. 37.Double 29 =
  38. 38.Double 41 =
  39. 39.Half of 138 =
  40. 40.Half of 110 =

Answer key

  1. 77
  2. 36
  3. 98
  4. 46
  5. 122
  6. 49
  7. 52
  8. 176
  9. 66
  10. 14
  11. 52
  12. 67
  13. 40
  14. 36
  15. 84
  16. 33
  17. 108
  18. 25
  19. 78
  20. 190
  21. 53
  22. 156
  23. 74
  24. 19
  25. 47
  26. 56
  27. 43
  28. 92
  29. 34
  30. 88
  31. 130
  32. 196
  33. 150
  34. 50
  35. 24
  36. 116
  37. 58
  38. 82
  39. 69
  40. 55

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