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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 208 · 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 31 =
  2. 2.Double 83 =
  3. 3.Half of 86 =
  4. 4.Half of 120 =
  5. 5.Half of 116 =
  6. 6.Double 54 =
  7. 7.Double 26 =
  8. 8.Half of 158 =
  9. 9.Half of 198 =
  10. 10.Double 94 =
  11. 11.Half of 62 =
  12. 12.Double 41 =
  13. 13.Half of 186 =
  14. 14.Double 55 =
  15. 15.Half of 182 =
  16. 16.Double 91 =
  17. 17.Half of 162 =
  18. 18.Half of 96 =
  19. 19.Half of 54 =
  20. 20.Half of 126 =
  21. 21.Half of 128 =
  22. 22.Double 67 =
  23. 23.Double 23 =
  24. 24.Double 28 =
  25. 25.Double 44 =
  26. 26.Double 22 =
  27. 27.Double 45 =
  28. 28.Double 35 =
  29. 29.Double 49 =
  30. 30.Half of 110 =
  31. 31.Double 21 =
  32. 32.Double 64 =
  33. 33.Double 17 =
  34. 34.Half of 68 =
  35. 35.Half of 82 =
  36. 36.Half of 38 =
  37. 37.Half of 48 =
  38. 38.Double 46 =
  39. 39.Half of 76 =
  40. 40.Half of 60 =

Answer key

  1. 62
  2. 166
  3. 43
  4. 60
  5. 58
  6. 108
  7. 52
  8. 79
  9. 99
  10. 188
  11. 31
  12. 82
  13. 93
  14. 110
  15. 91
  16. 182
  17. 81
  18. 48
  19. 27
  20. 63
  21. 64
  22. 134
  23. 46
  24. 56
  25. 88
  26. 44
  27. 90
  28. 70
  29. 98
  30. 55
  31. 42
  32. 128
  33. 34
  34. 34
  35. 41
  36. 19
  37. 24
  38. 92
  39. 38
  40. 30

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