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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 823 · 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 48 =
  2. 2.Half of 174 =
  3. 3.Half of 164 =
  4. 4.Double 39 =
  5. 5.Double 91 =
  6. 6.Double 82 =
  7. 7.Double 75 =
  8. 8.Half of 150 =
  9. 9.Double 25 =
  10. 10.Double 85 =
  11. 11.Double 37 =
  12. 12.Double 18 =
  13. 13.Double 17 =
  14. 14.Half of 138 =
  15. 15.Half of 60 =
  16. 16.Double 88 =
  17. 17.Half of 126 =
  18. 18.Double 49 =
  19. 19.Double 81 =
  20. 20.Double 22 =
  21. 21.Double 76 =
  22. 22.Half of 128 =
  23. 23.Half of 140 =
  24. 24.Double 26 =
  25. 25.Half of 172 =
  26. 26.Double 53 =
  27. 27.Double 23 =
  28. 28.Half of 46 =
  29. 29.Half of 106 =
  30. 30.Half of 28 =
  31. 31.Half of 96 =
  32. 32.Half of 94 =
  33. 33.Double 63 =
  34. 34.Half of 56 =
  35. 35.Half of 178 =
  36. 36.Half of 38 =
  37. 37.Half of 104 =
  38. 38.Half of 142 =
  39. 39.Half of 64 =
  40. 40.Double 87 =

Answer key

  1. 96
  2. 87
  3. 82
  4. 78
  5. 182
  6. 164
  7. 150
  8. 75
  9. 50
  10. 170
  11. 74
  12. 36
  13. 34
  14. 69
  15. 30
  16. 176
  17. 63
  18. 98
  19. 162
  20. 44
  21. 152
  22. 64
  23. 70
  24. 52
  25. 86
  26. 106
  27. 46
  28. 23
  29. 53
  30. 14
  31. 48
  32. 47
  33. 126
  34. 28
  35. 89
  36. 19
  37. 52
  38. 71
  39. 32
  40. 174

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