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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 276 · 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 76 =
  2. 2.Double 89 =
  3. 3.Half of 58 =
  4. 4.Double 28 =
  5. 5.Half of 80 =
  6. 6.Half of 194 =
  7. 7.Double 44 =
  8. 8.Half of 48 =
  9. 9.Double 27 =
  10. 10.Double 81 =
  11. 11.Double 61 =
  12. 12.Half of 44 =
  13. 13.Half of 46 =
  14. 14.Half of 40 =
  15. 15.Half of 90 =
  16. 16.Double 23 =
  17. 17.Double 65 =
  18. 18.Double 62 =
  19. 19.Half of 122 =
  20. 20.Half of 176 =
  21. 21.Half of 172 =
  22. 22.Double 41 =
  23. 23.Double 71 =
  24. 24.Double 36 =
  25. 25.Half of 148 =
  26. 26.Double 19 =
  27. 27.Double 75 =
  28. 28.Double 87 =
  29. 29.Double 51 =
  30. 30.Double 18 =
  31. 31.Half of 186 =
  32. 32.Half of 70 =
  33. 33.Half of 140 =
  34. 34.Half of 60 =
  35. 35.Half of 196 =
  36. 36.Half of 170 =
  37. 37.Double 21 =
  38. 38.Half of 84 =
  39. 39.Half of 52 =
  40. 40.Double 33 =

Answer key

  1. 38
  2. 178
  3. 29
  4. 56
  5. 40
  6. 97
  7. 88
  8. 24
  9. 54
  10. 162
  11. 122
  12. 22
  13. 23
  14. 20
  15. 45
  16. 46
  17. 130
  18. 124
  19. 61
  20. 88
  21. 86
  22. 82
  23. 142
  24. 72
  25. 74
  26. 38
  27. 150
  28. 174
  29. 102
  30. 36
  31. 93
  32. 35
  33. 70
  34. 30
  35. 98
  36. 85
  37. 42
  38. 42
  39. 26
  40. 66

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