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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 673 · 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 21 =
  2. 2.Double 71 =
  3. 3.Double 23 =
  4. 4.Double 41 =
  5. 5.Half of 92 =
  6. 6.Double 26 =
  7. 7.Double 16 =
  8. 8.Half of 64 =
  9. 9.Double 63 =
  10. 10.Double 93 =
  11. 11.Double 91 =
  12. 12.Half of 170 =
  13. 13.Double 73 =
  14. 14.Double 59 =
  15. 15.Half of 42 =
  16. 16.Double 22 =
  17. 17.Half of 48 =
  18. 18.Half of 190 =
  19. 19.Half of 124 =
  20. 20.Double 31 =
  21. 21.Half of 168 =
  22. 22.Half of 162 =
  23. 23.Double 89 =
  24. 24.Half of 160 =
  25. 25.Half of 146 =
  26. 26.Half of 54 =
  27. 27.Double 51 =
  28. 28.Double 92 =
  29. 29.Double 33 =
  30. 30.Half of 194 =
  31. 31.Double 82 =
  32. 32.Double 24 =
  33. 33.Double 87 =
  34. 34.Half of 34 =
  35. 35.Double 27 =
  36. 36.Half of 114 =
  37. 37.Half of 30 =
  38. 38.Half of 140 =
  39. 39.Double 99 =
  40. 40.Double 43 =

Answer key

  1. 42
  2. 142
  3. 46
  4. 82
  5. 46
  6. 52
  7. 32
  8. 32
  9. 126
  10. 186
  11. 182
  12. 85
  13. 146
  14. 118
  15. 21
  16. 44
  17. 24
  18. 95
  19. 62
  20. 62
  21. 84
  22. 81
  23. 178
  24. 80
  25. 73
  26. 27
  27. 102
  28. 184
  29. 66
  30. 97
  31. 164
  32. 48
  33. 174
  34. 17
  35. 54
  36. 57
  37. 15
  38. 70
  39. 198
  40. 86

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