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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 778 · 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 138 =
  2. 2.Double 21 =
  3. 3.Double 91 =
  4. 4.Half of 188 =
  5. 5.Half of 102 =
  6. 6.Double 93 =
  7. 7.Double 29 =
  8. 8.Double 51 =
  9. 9.Double 18 =
  10. 10.Half of 120 =
  11. 11.Half of 58 =
  12. 12.Double 95 =
  13. 13.Half of 36 =
  14. 14.Half of 98 =
  15. 15.Half of 116 =
  16. 16.Half of 26 =
  17. 17.Double 28 =
  18. 18.Double 38 =
  19. 19.Double 46 =
  20. 20.Double 75 =
  21. 21.Double 54 =
  22. 22.Double 36 =
  23. 23.Double 53 =
  24. 24.Half of 62 =
  25. 25.Double 97 =
  26. 26.Half of 76 =
  27. 27.Double 64 =
  28. 28.Double 22 =
  29. 29.Double 55 =
  30. 30.Half of 176 =
  31. 31.Half of 54 =
  32. 32.Double 27 =
  33. 33.Half of 30 =
  34. 34.Double 99 =
  35. 35.Half of 106 =
  36. 36.Double 35 =
  37. 37.Double 42 =
  38. 38.Double 85 =
  39. 39.Half of 180 =
  40. 40.Half of 110 =

Answer key

  1. 69
  2. 42
  3. 182
  4. 94
  5. 51
  6. 186
  7. 58
  8. 102
  9. 36
  10. 60
  11. 29
  12. 190
  13. 18
  14. 49
  15. 58
  16. 13
  17. 56
  18. 76
  19. 92
  20. 150
  21. 108
  22. 72
  23. 106
  24. 31
  25. 194
  26. 38
  27. 128
  28. 44
  29. 110
  30. 88
  31. 27
  32. 54
  33. 15
  34. 198
  35. 53
  36. 70
  37. 84
  38. 170
  39. 90
  40. 55

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