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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 458 · 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 158 =
  2. 2.Half of 140 =
  3. 3.Double 29 =
  4. 4.Double 19 =
  5. 5.Half of 146 =
  6. 6.Double 36 =
  7. 7.Half of 34 =
  8. 8.Double 38 =
  9. 9.Half of 196 =
  10. 10.Double 91 =
  11. 11.Double 21 =
  12. 12.Double 61 =
  13. 13.Double 75 =
  14. 14.Double 56 =
  15. 15.Half of 52 =
  16. 16.Half of 96 =
  17. 17.Double 96 =
  18. 18.Half of 58 =
  19. 19.Double 26 =
  20. 20.Half of 50 =
  21. 21.Double 18 =
  22. 22.Double 22 =
  23. 23.Double 16 =
  24. 24.Double 71 =
  25. 25.Half of 160 =
  26. 26.Half of 64 =
  27. 27.Double 88 =
  28. 28.Half of 132 =
  29. 29.Double 41 =
  30. 30.Double 49 =
  31. 31.Double 72 =
  32. 32.Double 81 =
  33. 33.Double 94 =
  34. 34.Half of 144 =
  35. 35.Double 54 =
  36. 36.Double 92 =
  37. 37.Double 32 =
  38. 38.Half of 176 =
  39. 39.Double 51 =
  40. 40.Half of 110 =

Answer key

  1. 79
  2. 70
  3. 58
  4. 38
  5. 73
  6. 72
  7. 17
  8. 76
  9. 98
  10. 182
  11. 42
  12. 122
  13. 150
  14. 112
  15. 26
  16. 48
  17. 192
  18. 29
  19. 52
  20. 25
  21. 36
  22. 44
  23. 32
  24. 142
  25. 80
  26. 32
  27. 176
  28. 66
  29. 82
  30. 98
  31. 144
  32. 162
  33. 188
  34. 72
  35. 108
  36. 184
  37. 64
  38. 88
  39. 102
  40. 55

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