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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 766 · 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 170 =
  2. 2.Half of 168 =
  3. 3.Half of 148 =
  4. 4.Half of 188 =
  5. 5.Double 89 =
  6. 6.Half of 34 =
  7. 7.Double 28 =
  8. 8.Half of 192 =
  9. 9.Double 99 =
  10. 10.Double 22 =
  11. 11.Half of 136 =
  12. 12.Double 48 =
  13. 13.Half of 72 =
  14. 14.Double 38 =
  15. 15.Double 25 =
  16. 16.Half of 144 =
  17. 17.Half of 110 =
  18. 18.Double 45 =
  19. 19.Half of 68 =
  20. 20.Half of 106 =
  21. 21.Double 64 =
  22. 22.Double 35 =
  23. 23.Double 33 =
  24. 24.Double 69 =
  25. 25.Half of 64 =
  26. 26.Double 52 =
  27. 27.Half of 70 =
  28. 28.Half of 46 =
  29. 29.Double 75 =
  30. 30.Double 51 =
  31. 31.Half of 174 =
  32. 32.Double 65 =
  33. 33.Double 88 =
  34. 34.Half of 58 =
  35. 35.Double 94 =
  36. 36.Double 41 =
  37. 37.Double 93 =
  38. 38.Double 31 =
  39. 39.Double 54 =
  40. 40.Half of 30 =

Answer key

  1. 85
  2. 84
  3. 74
  4. 94
  5. 178
  6. 17
  7. 56
  8. 96
  9. 198
  10. 44
  11. 68
  12. 96
  13. 36
  14. 76
  15. 50
  16. 72
  17. 55
  18. 90
  19. 34
  20. 53
  21. 128
  22. 70
  23. 66
  24. 138
  25. 32
  26. 104
  27. 35
  28. 23
  29. 150
  30. 102
  31. 87
  32. 130
  33. 176
  34. 29
  35. 188
  36. 82
  37. 186
  38. 62
  39. 108
  40. 15

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