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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 740 · 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 134 =
  2. 2.Half of 152 =
  3. 3.Double 72 =
  4. 4.Double 97 =
  5. 5.Double 63 =
  6. 6.Half of 138 =
  7. 7.Double 67 =
  8. 8.Half of 146 =
  9. 9.Half of 178 =
  10. 10.Half of 34 =
  11. 11.Double 61 =
  12. 12.Half of 48 =
  13. 13.Double 66 =
  14. 14.Double 38 =
  15. 15.Half of 170 =
  16. 16.Half of 176 =
  17. 17.Double 81 =
  18. 18.Half of 94 =
  19. 19.Half of 26 =
  20. 20.Half of 120 =
  21. 21.Half of 182 =
  22. 22.Double 71 =
  23. 23.Double 56 =
  24. 24.Double 73 =
  25. 25.Double 25 =
  26. 26.Double 46 =
  27. 27.Half of 64 =
  28. 28.Half of 70 =
  29. 29.Double 22 =
  30. 30.Double 42 =
  31. 31.Double 55 =
  32. 32.Half of 84 =
  33. 33.Double 19 =
  34. 34.Half of 80 =
  35. 35.Double 75 =
  36. 36.Half of 186 =
  37. 37.Double 35 =
  38. 38.Double 51 =
  39. 39.Half of 40 =
  40. 40.Double 17 =

Answer key

  1. 67
  2. 76
  3. 144
  4. 194
  5. 126
  6. 69
  7. 134
  8. 73
  9. 89
  10. 17
  11. 122
  12. 24
  13. 132
  14. 76
  15. 85
  16. 88
  17. 162
  18. 47
  19. 13
  20. 60
  21. 91
  22. 142
  23. 112
  24. 146
  25. 50
  26. 92
  27. 32
  28. 35
  29. 44
  30. 84
  31. 110
  32. 42
  33. 38
  34. 40
  35. 150
  36. 93
  37. 70
  38. 102
  39. 20
  40. 34

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