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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 700 · 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 54 =
  2. 2.Double 21 =
  3. 3.Half of 112 =
  4. 4.Double 91 =
  5. 5.Double 62 =
  6. 6.Half of 182 =
  7. 7.Double 19 =
  8. 8.Double 25 =
  9. 9.Half of 74 =
  10. 10.Half of 176 =
  11. 11.Half of 28 =
  12. 12.Half of 154 =
  13. 13.Half of 126 =
  14. 14.Half of 188 =
  15. 15.Double 29 =
  16. 16.Half of 100 =
  17. 17.Double 31 =
  18. 18.Double 22 =
  19. 19.Half of 50 =
  20. 20.Double 52 =
  21. 21.Half of 40 =
  22. 22.Half of 96 =
  23. 23.Double 81 =
  24. 24.Half of 36 =
  25. 25.Double 73 =
  26. 26.Half of 68 =
  27. 27.Half of 120 =
  28. 28.Half of 88 =
  29. 29.Double 38 =
  30. 30.Double 17 =
  31. 31.Half of 194 =
  32. 32.Double 75 =
  33. 33.Half of 70 =
  34. 34.Double 47 =
  35. 35.Double 36 =
  36. 36.Half of 172 =
  37. 37.Half of 170 =
  38. 38.Double 34 =
  39. 39.Double 68 =
  40. 40.Double 35 =

Answer key

  1. 108
  2. 42
  3. 56
  4. 182
  5. 124
  6. 91
  7. 38
  8. 50
  9. 37
  10. 88
  11. 14
  12. 77
  13. 63
  14. 94
  15. 58
  16. 50
  17. 62
  18. 44
  19. 25
  20. 104
  21. 20
  22. 48
  23. 162
  24. 18
  25. 146
  26. 34
  27. 60
  28. 44
  29. 76
  30. 34
  31. 97
  32. 150
  33. 35
  34. 94
  35. 72
  36. 86
  37. 85
  38. 68
  39. 136
  40. 70

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