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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 16 · 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 85 =
  3. 3.Double 41 =
  4. 4.Double 23 =
  5. 5.Double 91 =
  6. 6.Half of 44 =
  7. 7.Half of 38 =
  8. 8.Half of 52 =
  9. 9.Double 77 =
  10. 10.Half of 46 =
  11. 11.Half of 112 =
  12. 12.Half of 30 =
  13. 13.Double 19 =
  14. 14.Double 27 =
  15. 15.Half of 48 =
  16. 16.Half of 26 =
  17. 17.Half of 124 =
  18. 18.Half of 110 =
  19. 19.Double 55 =
  20. 20.Half of 182 =
  21. 21.Half of 194 =
  22. 22.Double 83 =
  23. 23.Half of 144 =
  24. 24.Double 71 =
  25. 25.Double 81 =
  26. 26.Double 32 =
  27. 27.Half of 190 =
  28. 28.Half of 166 =
  29. 29.Double 29 =
  30. 30.Double 63 =
  31. 31.Double 38 =
  32. 32.Double 48 =
  33. 33.Half of 74 =
  34. 34.Double 54 =
  35. 35.Half of 196 =
  36. 36.Double 35 =
  37. 37.Double 61 =
  38. 38.Double 24 =
  39. 39.Half of 92 =
  40. 40.Half of 54 =

Answer key

  1. 62
  2. 170
  3. 82
  4. 46
  5. 182
  6. 22
  7. 19
  8. 26
  9. 154
  10. 23
  11. 56
  12. 15
  13. 38
  14. 54
  15. 24
  16. 13
  17. 62
  18. 55
  19. 110
  20. 91
  21. 97
  22. 166
  23. 72
  24. 142
  25. 162
  26. 64
  27. 95
  28. 83
  29. 58
  30. 126
  31. 76
  32. 96
  33. 37
  34. 108
  35. 98
  36. 70
  37. 122
  38. 48
  39. 46
  40. 27

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