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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 586 · 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 162 =
  2. 2.Double 31 =
  3. 3.Double 54 =
  4. 4.Half of 136 =
  5. 5.Double 94 =
  6. 6.Half of 82 =
  7. 7.Double 44 =
  8. 8.Double 17 =
  9. 9.Half of 156 =
  10. 10.Half of 48 =
  11. 11.Half of 36 =
  12. 12.Double 64 =
  13. 13.Double 21 =
  14. 14.Half of 142 =
  15. 15.Double 16 =
  16. 16.Half of 66 =
  17. 17.Half of 96 =
  18. 18.Double 47 =
  19. 19.Double 29 =
  20. 20.Half of 60 =
  21. 21.Half of 38 =
  22. 22.Half of 188 =
  23. 23.Double 23 =
  24. 24.Half of 52 =
  25. 25.Double 18 =
  26. 26.Double 91 =
  27. 27.Half of 112 =
  28. 28.Half of 78 =
  29. 29.Double 52 =
  30. 30.Double 41 =
  31. 31.Double 77 =
  32. 32.Half of 194 =
  33. 33.Half of 122 =
  34. 34.Double 34 =
  35. 35.Double 45 =
  36. 36.Half of 56 =
  37. 37.Half of 110 =
  38. 38.Double 99 =
  39. 39.Double 51 =
  40. 40.Half of 64 =

Answer key

  1. 81
  2. 62
  3. 108
  4. 68
  5. 188
  6. 41
  7. 88
  8. 34
  9. 78
  10. 24
  11. 18
  12. 128
  13. 42
  14. 71
  15. 32
  16. 33
  17. 48
  18. 94
  19. 58
  20. 30
  21. 19
  22. 94
  23. 46
  24. 26
  25. 36
  26. 182
  27. 56
  28. 39
  29. 104
  30. 82
  31. 154
  32. 97
  33. 61
  34. 68
  35. 90
  36. 28
  37. 55
  38. 198
  39. 102
  40. 32

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