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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 817 · 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 31 =
  2. 2.Half of 128 =
  3. 3.Half of 84 =
  4. 4.Half of 146 =
  5. 5.Half of 170 =
  6. 6.Double 91 =
  7. 7.Double 21 =
  8. 8.Half of 50 =
  9. 9.Double 28 =
  10. 10.Half of 68 =
  11. 11.Double 81 =
  12. 12.Double 71 =
  13. 13.Double 36 =
  14. 14.Double 97 =
  15. 15.Half of 28 =
  16. 16.Double 22 =
  17. 17.Double 19 =
  18. 18.Double 93 =
  19. 19.Double 45 =
  20. 20.Half of 180 =
  21. 21.Half of 152 =
  22. 22.Double 23 =
  23. 23.Double 96 =
  24. 24.Half of 182 =
  25. 25.Half of 78 =
  26. 26.Double 63 =
  27. 27.Double 33 =
  28. 28.Half of 60 =
  29. 29.Double 16 =
  30. 30.Double 95 =
  31. 31.Half of 38 =
  32. 32.Double 27 =
  33. 33.Half of 86 =
  34. 34.Half of 138 =
  35. 35.Double 86 =
  36. 36.Double 51 =
  37. 37.Half of 118 =
  38. 38.Half of 120 =
  39. 39.Half of 156 =
  40. 40.Double 55 =

Answer key

  1. 62
  2. 64
  3. 42
  4. 73
  5. 85
  6. 182
  7. 42
  8. 25
  9. 56
  10. 34
  11. 162
  12. 142
  13. 72
  14. 194
  15. 14
  16. 44
  17. 38
  18. 186
  19. 90
  20. 90
  21. 76
  22. 46
  23. 192
  24. 91
  25. 39
  26. 126
  27. 66
  28. 30
  29. 32
  30. 190
  31. 19
  32. 54
  33. 43
  34. 69
  35. 172
  36. 102
  37. 59
  38. 60
  39. 78
  40. 110

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