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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 594 · 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 39 =
  2. 2.Double 83 =
  3. 3.Half of 178 =
  4. 4.Half of 28 =
  5. 5.Half of 122 =
  6. 6.Double 57 =
  7. 7.Half of 176 =
  8. 8.Half of 142 =
  9. 9.Double 84 =
  10. 10.Half of 56 =
  11. 11.Double 48 =
  12. 12.Half of 170 =
  13. 13.Half of 144 =
  14. 14.Double 28 =
  15. 15.Half of 62 =
  16. 16.Half of 36 =
  17. 17.Half of 126 =
  18. 18.Half of 42 =
  19. 19.Double 41 =
  20. 20.Double 22 =
  21. 21.Double 91 =
  22. 22.Double 32 =
  23. 23.Half of 26 =
  24. 24.Double 29 =
  25. 25.Half of 58 =
  26. 26.Double 58 =
  27. 27.Half of 114 =
  28. 28.Double 71 =
  29. 29.Half of 160 =
  30. 30.Half of 184 =
  31. 31.Half of 30 =
  32. 32.Double 21 =
  33. 33.Double 73 =
  34. 34.Half of 140 =
  35. 35.Half of 132 =
  36. 36.Double 72 =
  37. 37.Double 51 =
  38. 38.Double 59 =
  39. 39.Double 46 =
  40. 40.Double 26 =

Answer key

  1. 78
  2. 166
  3. 89
  4. 14
  5. 61
  6. 114
  7. 88
  8. 71
  9. 168
  10. 28
  11. 96
  12. 85
  13. 72
  14. 56
  15. 31
  16. 18
  17. 63
  18. 21
  19. 82
  20. 44
  21. 182
  22. 64
  23. 13
  24. 58
  25. 29
  26. 116
  27. 57
  28. 142
  29. 80
  30. 92
  31. 15
  32. 42
  33. 146
  34. 70
  35. 66
  36. 144
  37. 102
  38. 118
  39. 92
  40. 52

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