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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 307 · 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 62 =
  2. 2.Half of 60 =
  3. 3.Double 16 =
  4. 4.Double 53 =
  5. 5.Half of 54 =
  6. 6.Double 31 =
  7. 7.Double 38 =
  8. 8.Half of 96 =
  9. 9.Half of 64 =
  10. 10.Half of 156 =
  11. 11.Double 47 =
  12. 12.Double 95 =
  13. 13.Double 85 =
  14. 14.Double 56 =
  15. 15.Double 92 =
  16. 16.Half of 140 =
  17. 17.Double 87 =
  18. 18.Half of 198 =
  19. 19.Half of 192 =
  20. 20.Half of 144 =
  21. 21.Half of 194 =
  22. 22.Double 66 =
  23. 23.Half of 48 =
  24. 24.Half of 34 =
  25. 25.Double 36 =
  26. 26.Double 45 =
  27. 27.Double 59 =
  28. 28.Double 22 =
  29. 29.Double 48 =
  30. 30.Half of 100 =
  31. 31.Half of 118 =
  32. 32.Double 42 =
  33. 33.Half of 102 =
  34. 34.Double 21 =
  35. 35.Half of 126 =
  36. 36.Double 29 =
  37. 37.Double 26 =
  38. 38.Half of 58 =
  39. 39.Half of 98 =
  40. 40.Half of 146 =

Answer key

  1. 31
  2. 30
  3. 32
  4. 106
  5. 27
  6. 62
  7. 76
  8. 48
  9. 32
  10. 78
  11. 94
  12. 190
  13. 170
  14. 112
  15. 184
  16. 70
  17. 174
  18. 99
  19. 96
  20. 72
  21. 97
  22. 132
  23. 24
  24. 17
  25. 72
  26. 90
  27. 118
  28. 44
  29. 96
  30. 50
  31. 59
  32. 84
  33. 51
  34. 42
  35. 63
  36. 58
  37. 52
  38. 29
  39. 49
  40. 73

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