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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 254 · 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 19 =
  2. 2.Double 96 =
  3. 3.Half of 138 =
  4. 4.Half of 78 =
  5. 5.Half of 26 =
  6. 6.Half of 178 =
  7. 7.Double 71 =
  8. 8.Half of 74 =
  9. 9.Half of 172 =
  10. 10.Half of 156 =
  11. 11.Double 41 =
  12. 12.Half of 168 =
  13. 13.Double 42 =
  14. 14.Double 34 =
  15. 15.Double 21 =
  16. 16.Half of 90 =
  17. 17.Half of 92 =
  18. 18.Double 54 =
  19. 19.Half of 128 =
  20. 20.Double 49 =
  21. 21.Half of 116 =
  22. 22.Half of 194 =
  23. 23.Half of 98 =
  24. 24.Double 73 =
  25. 25.Half of 146 =
  26. 26.Double 88 =
  27. 27.Double 35 =
  28. 28.Half of 122 =
  29. 29.Double 29 =
  30. 30.Double 83 =
  31. 31.Double 55 =
  32. 32.Half of 88 =
  33. 33.Double 25 =
  34. 34.Double 37 =
  35. 35.Double 81 =
  36. 36.Double 94 =
  37. 37.Double 43 =
  38. 38.Double 64 =
  39. 39.Half of 68 =
  40. 40.Double 16 =

Answer key

  1. 38
  2. 192
  3. 69
  4. 39
  5. 13
  6. 89
  7. 142
  8. 37
  9. 86
  10. 78
  11. 82
  12. 84
  13. 84
  14. 68
  15. 42
  16. 45
  17. 46
  18. 108
  19. 64
  20. 98
  21. 58
  22. 97
  23. 49
  24. 146
  25. 73
  26. 176
  27. 70
  28. 61
  29. 58
  30. 166
  31. 110
  32. 44
  33. 50
  34. 74
  35. 162
  36. 188
  37. 86
  38. 128
  39. 34
  40. 32

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