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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 158 · 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 35 =
  2. 2.Double 41 =
  3. 3.Double 44 =
  4. 4.Half of 176 =
  5. 5.Half of 84 =
  6. 6.Double 47 =
  7. 7.Double 21 =
  8. 8.Half of 32 =
  9. 9.Double 68 =
  10. 10.Half of 168 =
  11. 11.Half of 70 =
  12. 12.Double 56 =
  13. 13.Half of 140 =
  14. 14.Double 28 =
  15. 15.Double 79 =
  16. 16.Half of 74 =
  17. 17.Half of 80 =
  18. 18.Half of 68 =
  19. 19.Double 31 =
  20. 20.Half of 198 =
  21. 21.Half of 96 =
  22. 22.Half of 126 =
  23. 23.Double 64 =
  24. 24.Double 91 =
  25. 25.Double 66 =
  26. 26.Double 95 =
  27. 27.Half of 100 =
  28. 28.Double 25 =
  29. 29.Half of 44 =
  30. 30.Double 61 =
  31. 31.Half of 118 =
  32. 32.Double 27 =
  33. 33.Double 19 =
  34. 34.Half of 56 =
  35. 35.Half of 150 =
  36. 36.Double 83 =
  37. 37.Half of 40 =
  38. 38.Half of 28 =
  39. 39.Half of 136 =
  40. 40.Half of 66 =

Answer key

  1. 70
  2. 82
  3. 88
  4. 88
  5. 42
  6. 94
  7. 42
  8. 16
  9. 136
  10. 84
  11. 35
  12. 112
  13. 70
  14. 56
  15. 158
  16. 37
  17. 40
  18. 34
  19. 62
  20. 99
  21. 48
  22. 63
  23. 128
  24. 182
  25. 132
  26. 190
  27. 50
  28. 50
  29. 22
  30. 122
  31. 59
  32. 54
  33. 38
  34. 28
  35. 75
  36. 166
  37. 20
  38. 14
  39. 68
  40. 33

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