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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 666 · 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 51 =
  2. 2.Double 31 =
  3. 3.Double 87 =
  4. 4.Half of 94 =
  5. 5.Double 92 =
  6. 6.Double 61 =
  7. 7.Half of 136 =
  8. 8.Half of 78 =
  9. 9.Double 16 =
  10. 10.Half of 30 =
  11. 11.Double 28 =
  12. 12.Half of 52 =
  13. 13.Double 54 =
  14. 14.Half of 180 =
  15. 15.Double 57 =
  16. 16.Half of 56 =
  17. 17.Double 21 =
  18. 18.Half of 36 =
  19. 19.Half of 162 =
  20. 20.Half of 142 =
  21. 21.Half of 34 =
  22. 22.Double 36 =
  23. 23.Double 29 =
  24. 24.Half of 74 =
  25. 25.Double 41 =
  26. 26.Double 27 =
  27. 27.Double 71 =
  28. 28.Half of 110 =
  29. 29.Double 62 =
  30. 30.Half of 198 =
  31. 31.Half of 120 =
  32. 32.Double 72 =
  33. 33.Double 65 =
  34. 34.Half of 92 =
  35. 35.Double 78 =
  36. 36.Double 52 =
  37. 37.Half of 140 =
  38. 38.Half of 170 =
  39. 39.Double 86 =
  40. 40.Half of 38 =

Answer key

  1. 102
  2. 62
  3. 174
  4. 47
  5. 184
  6. 122
  7. 68
  8. 39
  9. 32
  10. 15
  11. 56
  12. 26
  13. 108
  14. 90
  15. 114
  16. 28
  17. 42
  18. 18
  19. 81
  20. 71
  21. 17
  22. 72
  23. 58
  24. 37
  25. 82
  26. 54
  27. 142
  28. 55
  29. 124
  30. 99
  31. 60
  32. 144
  33. 130
  34. 46
  35. 156
  36. 104
  37. 70
  38. 85
  39. 172
  40. 19

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