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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 341 · 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 124 =
  2. 2.Double 33 =
  3. 3.Half of 134 =
  4. 4.Half of 120 =
  5. 5.Double 79 =
  6. 6.Half of 56 =
  7. 7.Half of 110 =
  8. 8.Half of 136 =
  9. 9.Double 39 =
  10. 10.Half of 30 =
  11. 11.Double 97 =
  12. 12.Half of 52 =
  13. 13.Double 31 =
  14. 14.Double 47 =
  15. 15.Half of 142 =
  16. 16.Double 25 =
  17. 17.Half of 28 =
  18. 18.Half of 34 =
  19. 19.Double 61 =
  20. 20.Double 73 =
  21. 21.Double 41 =
  22. 22.Double 68 =
  23. 23.Half of 50 =
  24. 24.Half of 162 =
  25. 25.Double 21 =
  26. 26.Double 51 =
  27. 27.Double 35 =
  28. 28.Double 54 =
  29. 29.Double 85 =
  30. 30.Half of 66 =
  31. 31.Double 34 =
  32. 32.Double 93 =
  33. 33.Double 22 =
  34. 34.Half of 60 =
  35. 35.Half of 26 =
  36. 36.Double 88 =
  37. 37.Half of 174 =
  38. 38.Half of 196 =
  39. 39.Double 32 =
  40. 40.Half of 102 =

Answer key

  1. 62
  2. 66
  3. 67
  4. 60
  5. 158
  6. 28
  7. 55
  8. 68
  9. 78
  10. 15
  11. 194
  12. 26
  13. 62
  14. 94
  15. 71
  16. 50
  17. 14
  18. 17
  19. 122
  20. 146
  21. 82
  22. 136
  23. 25
  24. 81
  25. 42
  26. 102
  27. 70
  28. 108
  29. 170
  30. 33
  31. 68
  32. 186
  33. 44
  34. 30
  35. 13
  36. 176
  37. 87
  38. 98
  39. 64
  40. 51

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