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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 4 · 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 34 =
  2. 2.Double 43 =
  3. 3.Double 91 =
  4. 4.Double 54 =
  5. 5.Half of 42 =
  6. 6.Double 17 =
  7. 7.Half of 34 =
  8. 8.Half of 144 =
  9. 9.Half of 170 =
  10. 10.Double 83 =
  11. 11.Double 41 =
  12. 12.Double 94 =
  13. 13.Double 71 =
  14. 14.Half of 82 =
  15. 15.Half of 196 =
  16. 16.Double 31 =
  17. 17.Half of 38 =
  18. 18.Half of 110 =
  19. 19.Half of 156 =
  20. 20.Double 21 =
  21. 21.Half of 100 =
  22. 22.Double 36 =
  23. 23.Double 29 =
  24. 24.Half of 142 =
  25. 25.Half of 164 =
  26. 26.Half of 194 =
  27. 27.Double 63 =
  28. 28.Double 51 =
  29. 29.Double 33 =
  30. 30.Half of 50 =
  31. 31.Double 16 =
  32. 32.Double 74 =
  33. 33.Double 57 =
  34. 34.Double 22 =
  35. 35.Double 98 =
  36. 36.Double 32 =
  37. 37.Double 72 =
  38. 38.Double 18 =
  39. 39.Half of 176 =
  40. 40.Half of 158 =

Answer key

  1. 68
  2. 86
  3. 182
  4. 108
  5. 21
  6. 34
  7. 17
  8. 72
  9. 85
  10. 166
  11. 82
  12. 188
  13. 142
  14. 41
  15. 98
  16. 62
  17. 19
  18. 55
  19. 78
  20. 42
  21. 50
  22. 72
  23. 58
  24. 71
  25. 82
  26. 97
  27. 126
  28. 102
  29. 66
  30. 25
  31. 32
  32. 148
  33. 114
  34. 44
  35. 196
  36. 64
  37. 144
  38. 36
  39. 88
  40. 79

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