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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 302 · 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 18 =
  2. 2.Double 38 =
  3. 3.Double 84 =
  4. 4.Double 29 =
  5. 5.Half of 118 =
  6. 6.Half of 116 =
  7. 7.Double 66 =
  8. 8.Half of 70 =
  9. 9.Half of 80 =
  10. 10.Half of 86 =
  11. 11.Double 41 =
  12. 12.Half of 184 =
  13. 13.Double 24 =
  14. 14.Half of 44 =
  15. 15.Half of 180 =
  16. 16.Half of 128 =
  17. 17.Double 31 =
  18. 18.Double 32 =
  19. 19.Half of 162 =
  20. 20.Half of 194 =
  21. 21.Double 97 =
  22. 22.Half of 100 =
  23. 23.Half of 114 =
  24. 24.Double 54 =
  25. 25.Double 53 =
  26. 26.Half of 132 =
  27. 27.Double 25 =
  28. 28.Half of 142 =
  29. 29.Double 35 =
  30. 30.Half of 60 =
  31. 31.Double 63 =
  32. 32.Half of 126 =
  33. 33.Double 65 =
  34. 34.Double 23 =
  35. 35.Double 44 =
  36. 36.Double 22 =
  37. 37.Double 94 =
  38. 38.Half of 198 =
  39. 39.Double 42 =
  40. 40.Half of 34 =

Answer key

  1. 36
  2. 76
  3. 168
  4. 58
  5. 59
  6. 58
  7. 132
  8. 35
  9. 40
  10. 43
  11. 82
  12. 92
  13. 48
  14. 22
  15. 90
  16. 64
  17. 62
  18. 64
  19. 81
  20. 97
  21. 194
  22. 50
  23. 57
  24. 108
  25. 106
  26. 66
  27. 50
  28. 71
  29. 70
  30. 30
  31. 126
  32. 63
  33. 130
  34. 46
  35. 88
  36. 44
  37. 188
  38. 99
  39. 84
  40. 17

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