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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 424 · 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 55 =
  2. 2.Half of 68 =
  3. 3.Double 54 =
  4. 4.Half of 78 =
  5. 5.Half of 160 =
  6. 6.Double 18 =
  7. 7.Double 43 =
  8. 8.Double 38 =
  9. 9.Double 88 =
  10. 10.Double 84 =
  11. 11.Half of 146 =
  12. 12.Half of 72 =
  13. 13.Half of 60 =
  14. 14.Half of 84 =
  15. 15.Double 41 =
  16. 16.Double 91 =
  17. 17.Half of 36 =
  18. 18.Double 85 =
  19. 19.Half of 168 =
  20. 20.Half of 86 =
  21. 21.Double 37 =
  22. 22.Half of 94 =
  23. 23.Double 58 =
  24. 24.Double 49 =
  25. 25.Half of 172 =
  26. 26.Double 25 =
  27. 27.Double 75 =
  28. 28.Half of 182 =
  29. 29.Half of 90 =
  30. 30.Double 98 =
  31. 31.Double 59 =
  32. 32.Double 17 =
  33. 33.Half of 28 =
  34. 34.Half of 64 =
  35. 35.Half of 26 =
  36. 36.Double 23 =
  37. 37.Half of 62 =
  38. 38.Double 95 =
  39. 39.Half of 138 =
  40. 40.Double 29 =

Answer key

  1. 110
  2. 34
  3. 108
  4. 39
  5. 80
  6. 36
  7. 86
  8. 76
  9. 176
  10. 168
  11. 73
  12. 36
  13. 30
  14. 42
  15. 82
  16. 182
  17. 18
  18. 170
  19. 84
  20. 43
  21. 74
  22. 47
  23. 116
  24. 98
  25. 86
  26. 50
  27. 150
  28. 91
  29. 45
  30. 196
  31. 118
  32. 34
  33. 14
  34. 32
  35. 13
  36. 46
  37. 31
  38. 190
  39. 69
  40. 58

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