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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 97 · 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 164 =
  2. 2.Double 41 =
  3. 3.Double 16 =
  4. 4.Half of 88 =
  5. 5.Double 62 =
  6. 6.Double 32 =
  7. 7.Half of 90 =
  8. 8.Double 24 =
  9. 9.Double 81 =
  10. 10.Double 54 =
  11. 11.Double 21 =
  12. 12.Half of 104 =
  13. 13.Double 94 =
  14. 14.Double 69 =
  15. 15.Double 71 =
  16. 16.Half of 112 =
  17. 17.Half of 38 =
  18. 18.Half of 150 =
  19. 19.Double 93 =
  20. 20.Half of 158 =
  21. 21.Half of 92 =
  22. 22.Half of 198 =
  23. 23.Double 36 =
  24. 24.Half of 162 =
  25. 25.Half of 168 =
  26. 26.Double 46 =
  27. 27.Half of 40 =
  28. 28.Double 85 =
  29. 29.Double 84 =
  30. 30.Double 47 =
  31. 31.Half of 56 =
  32. 32.Half of 152 =
  33. 33.Double 25 =
  34. 34.Double 91 =
  35. 35.Half of 52 =
  36. 36.Half of 170 =
  37. 37.Double 78 =
  38. 38.Half of 138 =
  39. 39.Half of 48 =
  40. 40.Double 51 =

Answer key

  1. 82
  2. 82
  3. 32
  4. 44
  5. 124
  6. 64
  7. 45
  8. 48
  9. 162
  10. 108
  11. 42
  12. 52
  13. 188
  14. 138
  15. 142
  16. 56
  17. 19
  18. 75
  19. 186
  20. 79
  21. 46
  22. 99
  23. 72
  24. 81
  25. 84
  26. 92
  27. 20
  28. 170
  29. 168
  30. 94
  31. 28
  32. 76
  33. 50
  34. 182
  35. 26
  36. 85
  37. 156
  38. 69
  39. 24
  40. 102

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