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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 79 · 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.Half of 100 =
  2. 2.Half of 50 =
  3. 3.Half of 28 =
  4. 4.Half of 62 =
  5. 5.Half of 34 =
  6. 6.Double 55 =
  7. 7.Half of 78 =
  8. 8.Half of 48 =
  9. 9.Double 93 =
  10. 10.Double 33 =
  11. 11.Half of 92 =
  12. 12.Half of 46 =
  13. 13.Double 25 =
  14. 14.Double 74 =
  15. 15.Double 98 =
  16. 16.Double 23 =
  17. 17.Double 99 =
  18. 18.Double 37 =
  19. 19.Double 76 =
  20. 20.Double 51 =
  21. 21.Half of 36 =
  22. 22.Double 21 =
  23. 23.Double 73 =
  24. 24.Half of 166 =
  25. 25.Double 28 =
  26. 26.Double 45 =
  27. 27.Double 31 =
  28. 28.Half of 76 =
  29. 29.Double 75 =
  30. 30.Double 71 =
  31. 31.Double 27 =
  32. 32.Half of 160 =
  33. 33.Double 67 =
  34. 34.Double 17 =
  35. 35.Half of 88 =
  36. 36.Half of 136 =
  37. 37.Half of 110 =
  38. 38.Double 43 =
  39. 39.Half of 146 =
  40. 40.Half of 150 =

Answer key

  1. 50
  2. 25
  3. 14
  4. 31
  5. 17
  6. 110
  7. 39
  8. 24
  9. 186
  10. 66
  11. 46
  12. 23
  13. 50
  14. 148
  15. 196
  16. 46
  17. 198
  18. 74
  19. 152
  20. 102
  21. 18
  22. 42
  23. 146
  24. 83
  25. 56
  26. 90
  27. 62
  28. 38
  29. 150
  30. 142
  31. 54
  32. 80
  33. 134
  34. 34
  35. 44
  36. 68
  37. 55
  38. 86
  39. 73
  40. 75

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