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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 543 · 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 38 =
  2. 2.Double 72 =
  3. 3.Half of 100 =
  4. 4.Double 28 =
  5. 5.Double 37 =
  6. 6.Double 44 =
  7. 7.Double 22 =
  8. 8.Half of 194 =
  9. 9.Half of 150 =
  10. 10.Half of 164 =
  11. 11.Half of 152 =
  12. 12.Half of 80 =
  13. 13.Double 21 =
  14. 14.Double 24 =
  15. 15.Half of 122 =
  16. 16.Double 88 =
  17. 17.Double 81 =
  18. 18.Double 49 =
  19. 19.Half of 184 =
  20. 20.Half of 48 =
  21. 21.Double 71 =
  22. 22.Double 89 =
  23. 23.Double 59 =
  24. 24.Half of 78 =
  25. 25.Double 85 =
  26. 26.Double 56 =
  27. 27.Double 16 =
  28. 28.Half of 178 =
  29. 29.Half of 128 =
  30. 30.Half of 108 =
  31. 31.Half of 192 =
  32. 32.Double 33 =
  33. 33.Double 42 =
  34. 34.Double 41 =
  35. 35.Double 35 =
  36. 36.Half of 64 =
  37. 37.Double 34 =
  38. 38.Double 99 =
  39. 39.Half of 34 =
  40. 40.Half of 160 =

Answer key

  1. 19
  2. 144
  3. 50
  4. 56
  5. 74
  6. 88
  7. 44
  8. 97
  9. 75
  10. 82
  11. 76
  12. 40
  13. 42
  14. 48
  15. 61
  16. 176
  17. 162
  18. 98
  19. 92
  20. 24
  21. 142
  22. 178
  23. 118
  24. 39
  25. 170
  26. 112
  27. 32
  28. 89
  29. 64
  30. 54
  31. 96
  32. 66
  33. 84
  34. 82
  35. 70
  36. 32
  37. 68
  38. 198
  39. 17
  40. 80

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