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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 143 · 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 66 =
  2. 2.Half of 36 =
  3. 3.Half of 180 =
  4. 4.Half of 26 =
  5. 5.Double 51 =
  6. 6.Double 16 =
  7. 7.Half of 176 =
  8. 8.Double 94 =
  9. 9.Half of 186 =
  10. 10.Double 62 =
  11. 11.Double 31 =
  12. 12.Double 25 =
  13. 13.Half of 84 =
  14. 14.Half of 112 =
  15. 15.Double 58 =
  16. 16.Double 68 =
  17. 17.Double 28 =
  18. 18.Double 66 =
  19. 19.Double 96 =
  20. 20.Half of 156 =
  21. 21.Half of 148 =
  22. 22.Half of 120 =
  23. 23.Half of 110 =
  24. 24.Half of 78 =
  25. 25.Half of 130 =
  26. 26.Double 32 =
  27. 27.Double 29 =
  28. 28.Double 24 =
  29. 29.Double 97 =
  30. 30.Half of 76 =
  31. 31.Half of 40 =
  32. 32.Half of 90 =
  33. 33.Half of 168 =
  34. 34.Double 65 =
  35. 35.Double 57 =
  36. 36.Half of 92 =
  37. 37.Double 18 =
  38. 38.Double 71 =
  39. 39.Double 69 =
  40. 40.Double 21 =

Answer key

  1. 33
  2. 18
  3. 90
  4. 13
  5. 102
  6. 32
  7. 88
  8. 188
  9. 93
  10. 124
  11. 62
  12. 50
  13. 42
  14. 56
  15. 116
  16. 136
  17. 56
  18. 132
  19. 192
  20. 78
  21. 74
  22. 60
  23. 55
  24. 39
  25. 65
  26. 64
  27. 58
  28. 48
  29. 194
  30. 38
  31. 20
  32. 45
  33. 84
  34. 130
  35. 114
  36. 46
  37. 36
  38. 142
  39. 138
  40. 42

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