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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 464 · 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 68 =
  2. 2.Double 35 =
  3. 3.Half of 30 =
  4. 4.Half of 92 =
  5. 5.Half of 60 =
  6. 6.Double 31 =
  7. 7.Double 92 =
  8. 8.Double 97 =
  9. 9.Half of 162 =
  10. 10.Double 26 =
  11. 11.Half of 196 =
  12. 12.Double 59 =
  13. 13.Half of 36 =
  14. 14.Double 84 =
  15. 15.Double 77 =
  16. 16.Double 21 =
  17. 17.Double 41 =
  18. 18.Half of 106 =
  19. 19.Half of 74 =
  20. 20.Half of 182 =
  21. 21.Double 55 =
  22. 22.Half of 62 =
  23. 23.Half of 58 =
  24. 24.Half of 56 =
  25. 25.Double 61 =
  26. 26.Double 34 =
  27. 27.Half of 142 =
  28. 28.Double 99 =
  29. 29.Half of 110 =
  30. 30.Half of 88 =
  31. 31.Half of 100 =
  32. 32.Double 28 =
  33. 33.Half of 198 =
  34. 34.Half of 166 =
  35. 35.Double 32 =
  36. 36.Half of 90 =
  37. 37.Half of 44 =
  38. 38.Double 52 =
  39. 39.Half of 40 =
  40. 40.Double 69 =

Answer key

  1. 34
  2. 70
  3. 15
  4. 46
  5. 30
  6. 62
  7. 184
  8. 194
  9. 81
  10. 52
  11. 98
  12. 118
  13. 18
  14. 168
  15. 154
  16. 42
  17. 82
  18. 53
  19. 37
  20. 91
  21. 110
  22. 31
  23. 29
  24. 28
  25. 122
  26. 68
  27. 71
  28. 198
  29. 55
  30. 44
  31. 50
  32. 56
  33. 99
  34. 83
  35. 64
  36. 45
  37. 22
  38. 104
  39. 20
  40. 138

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