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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 791 · 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 51 =
  2. 2.Double 31 =
  3. 3.Half of 162 =
  4. 4.Half of 56 =
  5. 5.Half of 60 =
  6. 6.Half of 182 =
  7. 7.Half of 112 =
  8. 8.Half of 62 =
  9. 9.Half of 34 =
  10. 10.Double 97 =
  11. 11.Double 41 =
  12. 12.Double 25 =
  13. 13.Half of 138 =
  14. 14.Double 78 =
  15. 15.Double 53 =
  16. 16.Double 33 =
  17. 17.Double 38 =
  18. 18.Half of 26 =
  19. 19.Half of 30 =
  20. 20.Half of 158 =
  21. 21.Half of 70 =
  22. 22.Half of 46 =
  23. 23.Double 43 =
  24. 24.Double 63 =
  25. 25.Double 68 =
  26. 26.Double 49 =
  27. 27.Double 71 =
  28. 28.Half of 66 =
  29. 29.Half of 90 =
  30. 30.Double 42 =
  31. 31.Double 52 =
  32. 32.Half of 78 =
  33. 33.Half of 148 =
  34. 34.Half of 98 =
  35. 35.Half of 174 =
  36. 36.Double 86 =
  37. 37.Double 21 =
  38. 38.Half of 42 =
  39. 39.Double 32 =
  40. 40.Half of 142 =

Answer key

  1. 102
  2. 62
  3. 81
  4. 28
  5. 30
  6. 91
  7. 56
  8. 31
  9. 17
  10. 194
  11. 82
  12. 50
  13. 69
  14. 156
  15. 106
  16. 66
  17. 76
  18. 13
  19. 15
  20. 79
  21. 35
  22. 23
  23. 86
  24. 126
  25. 136
  26. 98
  27. 142
  28. 33
  29. 45
  30. 84
  31. 104
  32. 39
  33. 74
  34. 49
  35. 87
  36. 172
  37. 42
  38. 21
  39. 64
  40. 71

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