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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 366 · 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 23 =
  2. 2.Double 31 =
  3. 3.Double 46 =
  4. 4.Half of 92 =
  5. 5.Double 51 =
  6. 6.Double 75 =
  7. 7.Half of 44 =
  8. 8.Half of 178 =
  9. 9.Double 32 =
  10. 10.Half of 46 =
  11. 11.Half of 162 =
  12. 12.Double 65 =
  13. 13.Double 92 =
  14. 14.Double 45 =
  15. 15.Half of 28 =
  16. 16.Half of 150 =
  17. 17.Half of 170 =
  18. 18.Double 33 =
  19. 19.Double 41 =
  20. 20.Half of 26 =
  21. 21.Half of 60 =
  22. 22.Half of 148 =
  23. 23.Double 63 =
  24. 24.Half of 194 =
  25. 25.Half of 142 =
  26. 26.Double 47 =
  27. 27.Double 77 =
  28. 28.Half of 86 =
  29. 29.Half of 36 =
  30. 30.Half of 122 =
  31. 31.Double 61 =
  32. 32.Half of 72 =
  33. 33.Half of 126 =
  34. 34.Half of 56 =
  35. 35.Double 71 =
  36. 36.Double 81 =
  37. 37.Double 36 =
  38. 38.Double 34 =
  39. 39.Half of 68 =
  40. 40.Double 66 =

Answer key

  1. 46
  2. 62
  3. 92
  4. 46
  5. 102
  6. 150
  7. 22
  8. 89
  9. 64
  10. 23
  11. 81
  12. 130
  13. 184
  14. 90
  15. 14
  16. 75
  17. 85
  18. 66
  19. 82
  20. 13
  21. 30
  22. 74
  23. 126
  24. 97
  25. 71
  26. 94
  27. 154
  28. 43
  29. 18
  30. 61
  31. 122
  32. 36
  33. 63
  34. 28
  35. 142
  36. 162
  37. 72
  38. 68
  39. 34
  40. 132

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