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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 456 · 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 56 =
  2. 2.Double 24 =
  3. 3.Double 64 =
  4. 4.Half of 138 =
  5. 5.Double 38 =
  6. 6.Half of 44 =
  7. 7.Half of 140 =
  8. 8.Double 39 =
  9. 9.Half of 68 =
  10. 10.Double 65 =
  11. 11.Double 42 =
  12. 12.Double 87 =
  13. 13.Half of 192 =
  14. 14.Half of 82 =
  15. 15.Half of 106 =
  16. 16.Double 31 =
  17. 17.Half of 36 =
  18. 18.Double 33 =
  19. 19.Double 22 =
  20. 20.Double 84 =
  21. 21.Double 34 =
  22. 22.Double 25 =
  23. 23.Double 62 =
  24. 24.Double 63 =
  25. 25.Double 98 =
  26. 26.Double 85 =
  27. 27.Double 36 =
  28. 28.Double 59 =
  29. 29.Double 72 =
  30. 30.Double 97 =
  31. 31.Half of 60 =
  32. 32.Double 26 =
  33. 33.Double 68 =
  34. 34.Double 54 =
  35. 35.Double 94 =
  36. 36.Half of 74 =
  37. 37.Half of 66 =
  38. 38.Double 95 =
  39. 39.Double 91 =
  40. 40.Double 28 =

Answer key

  1. 112
  2. 48
  3. 128
  4. 69
  5. 76
  6. 22
  7. 70
  8. 78
  9. 34
  10. 130
  11. 84
  12. 174
  13. 96
  14. 41
  15. 53
  16. 62
  17. 18
  18. 66
  19. 44
  20. 168
  21. 68
  22. 50
  23. 124
  24. 126
  25. 196
  26. 170
  27. 72
  28. 118
  29. 144
  30. 194
  31. 30
  32. 52
  33. 136
  34. 108
  35. 188
  36. 37
  37. 33
  38. 190
  39. 182
  40. 56

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