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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 353 · 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 17 =
  2. 2.Half of 130 =
  3. 3.Double 62 =
  4. 4.Double 22 =
  5. 5.Half of 138 =
  6. 6.Double 57 =
  7. 7.Double 23 =
  8. 8.Double 54 =
  9. 9.Half of 182 =
  10. 10.Double 34 =
  11. 11.Half of 136 =
  12. 12.Double 91 =
  13. 13.Double 25 =
  14. 14.Half of 194 =
  15. 15.Double 89 =
  16. 16.Double 77 =
  17. 17.Half of 172 =
  18. 18.Double 65 =
  19. 19.Half of 94 =
  20. 20.Double 28 =
  21. 21.Double 79 =
  22. 22.Double 35 =
  23. 23.Half of 102 =
  24. 24.Double 48 =
  25. 25.Half of 192 =
  26. 26.Double 85 =
  27. 27.Half of 120 =
  28. 28.Double 18 =
  29. 29.Double 33 =
  30. 30.Half of 66 =
  31. 31.Half of 110 =
  32. 32.Double 21 =
  33. 33.Half of 132 =
  34. 34.Double 41 =
  35. 35.Double 45 =
  36. 36.Half of 34 =
  37. 37.Double 52 =
  38. 38.Double 73 =
  39. 39.Double 71 =
  40. 40.Half of 190 =

Answer key

  1. 34
  2. 65
  3. 124
  4. 44
  5. 69
  6. 114
  7. 46
  8. 108
  9. 91
  10. 68
  11. 68
  12. 182
  13. 50
  14. 97
  15. 178
  16. 154
  17. 86
  18. 130
  19. 47
  20. 56
  21. 158
  22. 70
  23. 51
  24. 96
  25. 96
  26. 170
  27. 60
  28. 36
  29. 66
  30. 33
  31. 55
  32. 42
  33. 66
  34. 82
  35. 90
  36. 17
  37. 104
  38. 146
  39. 142
  40. 95

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