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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 548 · 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 17 =
  2. 2.Half of 146 =
  3. 3.Half of 58 =
  4. 4.Double 65 =
  5. 5.Double 53 =
  6. 6.Double 62 =
  7. 7.Double 16 =
  8. 8.Half of 152 =
  9. 9.Half of 66 =
  10. 10.Double 67 =
  11. 11.Double 97 =
  12. 12.Double 29 =
  13. 13.Double 43 =
  14. 14.Half of 84 =
  15. 15.Double 86 =
  16. 16.Double 84 =
  17. 17.Double 31 =
  18. 18.Double 41 =
  19. 19.Half of 56 =
  20. 20.Half of 180 =
  21. 21.Double 35 =
  22. 22.Half of 156 =
  23. 23.Double 55 =
  24. 24.Double 21 =
  25. 25.Double 83 =
  26. 26.Double 79 =
  27. 27.Half of 52 =
  28. 28.Half of 86 =
  29. 29.Half of 44 =
  30. 30.Half of 150 =
  31. 31.Double 37 =
  32. 32.Double 33 =
  33. 33.Double 47 =
  34. 34.Half of 70 =
  35. 35.Half of 48 =
  36. 36.Half of 80 =
  37. 37.Double 24 =
  38. 38.Half of 154 =
  39. 39.Half of 140 =
  40. 40.Double 25 =

Answer key

  1. 34
  2. 73
  3. 29
  4. 130
  5. 106
  6. 124
  7. 32
  8. 76
  9. 33
  10. 134
  11. 194
  12. 58
  13. 86
  14. 42
  15. 172
  16. 168
  17. 62
  18. 82
  19. 28
  20. 90
  21. 70
  22. 78
  23. 110
  24. 42
  25. 166
  26. 158
  27. 26
  28. 43
  29. 22
  30. 75
  31. 74
  32. 66
  33. 94
  34. 35
  35. 24
  36. 40
  37. 48
  38. 77
  39. 70
  40. 50

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