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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 788 · 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 84 =
  2. 2.Double 39 =
  3. 3.Half of 76 =
  4. 4.Half of 176 =
  5. 5.Double 92 =
  6. 6.Half of 48 =
  7. 7.Half of 136 =
  8. 8.Half of 134 =
  9. 9.Half of 160 =
  10. 10.Double 16 =
  11. 11.Double 77 =
  12. 12.Double 28 =
  13. 13.Double 53 =
  14. 14.Double 32 =
  15. 15.Half of 88 =
  16. 16.Double 31 =
  17. 17.Double 41 =
  18. 18.Half of 120 =
  19. 19.Half of 56 =
  20. 20.Half of 124 =
  21. 21.Half of 70 =
  22. 22.Double 87 =
  23. 23.Double 36 =
  24. 24.Half of 114 =
  25. 25.Double 69 =
  26. 26.Double 68 =
  27. 27.Double 61 =
  28. 28.Half of 174 =
  29. 29.Double 94 =
  30. 30.Half of 138 =
  31. 31.Double 96 =
  32. 32.Half of 190 =
  33. 33.Double 63 =
  34. 34.Half of 110 =
  35. 35.Double 25 =
  36. 36.Half of 172 =
  37. 37.Half of 54 =
  38. 38.Half of 80 =
  39. 39.Double 19 =
  40. 40.Double 38 =

Answer key

  1. 42
  2. 78
  3. 38
  4. 88
  5. 184
  6. 24
  7. 68
  8. 67
  9. 80
  10. 32
  11. 154
  12. 56
  13. 106
  14. 64
  15. 44
  16. 62
  17. 82
  18. 60
  19. 28
  20. 62
  21. 35
  22. 174
  23. 72
  24. 57
  25. 138
  26. 136
  27. 122
  28. 87
  29. 188
  30. 69
  31. 192
  32. 95
  33. 126
  34. 55
  35. 50
  36. 86
  37. 27
  38. 40
  39. 38
  40. 76

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