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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 636 · 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 49 =
  2. 2.Half of 190 =
  3. 3.Double 92 =
  4. 4.Double 52 =
  5. 5.Half of 74 =
  6. 6.Half of 60 =
  7. 7.Half of 30 =
  8. 8.Double 21 =
  9. 9.Half of 110 =
  10. 10.Half of 156 =
  11. 11.Half of 56 =
  12. 12.Half of 136 =
  13. 13.Half of 70 =
  14. 14.Half of 36 =
  15. 15.Half of 88 =
  16. 16.Half of 26 =
  17. 17.Double 54 =
  18. 18.Half of 160 =
  19. 19.Double 63 =
  20. 20.Half of 178 =
  21. 21.Double 31 =
  22. 22.Half of 168 =
  23. 23.Half of 100 =
  24. 24.Double 79 =
  25. 25.Half of 98 =
  26. 26.Double 22 =
  27. 27.Half of 138 =
  28. 28.Double 37 =
  29. 29.Half of 166 =
  30. 30.Double 48 =
  31. 31.Double 25 =
  32. 32.Double 74 =
  33. 33.Double 23 =
  34. 34.Half of 150 =
  35. 35.Double 46 =
  36. 36.Half of 152 =
  37. 37.Double 85 =
  38. 38.Half of 32 =
  39. 39.Double 78 =
  40. 40.Double 75 =

Answer key

  1. 98
  2. 95
  3. 184
  4. 104
  5. 37
  6. 30
  7. 15
  8. 42
  9. 55
  10. 78
  11. 28
  12. 68
  13. 35
  14. 18
  15. 44
  16. 13
  17. 108
  18. 80
  19. 126
  20. 89
  21. 62
  22. 84
  23. 50
  24. 158
  25. 49
  26. 44
  27. 69
  28. 74
  29. 83
  30. 96
  31. 50
  32. 148
  33. 46
  34. 75
  35. 92
  36. 76
  37. 170
  38. 16
  39. 156
  40. 150

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