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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 814 · 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 86 =
  2. 2.Half of 158 =
  3. 3.Double 61 =
  4. 4.Half of 176 =
  5. 5.Half of 190 =
  6. 6.Double 49 =
  7. 7.Double 71 =
  8. 8.Half of 78 =
  9. 9.Half of 52 =
  10. 10.Half of 26 =
  11. 11.Half of 46 =
  12. 12.Half of 194 =
  13. 13.Double 17 =
  14. 14.Half of 166 =
  15. 15.Half of 146 =
  16. 16.Double 51 =
  17. 17.Half of 106 =
  18. 18.Double 31 =
  19. 19.Double 73 =
  20. 20.Half of 48 =
  21. 21.Double 53 =
  22. 22.Half of 86 =
  23. 23.Half of 104 =
  24. 24.Double 85 =
  25. 25.Half of 174 =
  26. 26.Double 82 =
  27. 27.Double 92 =
  28. 28.Half of 160 =
  29. 29.Half of 64 =
  30. 30.Half of 110 =
  31. 31.Double 89 =
  32. 32.Half of 182 =
  33. 33.Double 44 =
  34. 34.Double 25 =
  35. 35.Double 63 =
  36. 36.Half of 126 =
  37. 37.Double 41 =
  38. 38.Double 37 =
  39. 39.Half of 60 =
  40. 40.Double 47 =

Answer key

  1. 172
  2. 79
  3. 122
  4. 88
  5. 95
  6. 98
  7. 142
  8. 39
  9. 26
  10. 13
  11. 23
  12. 97
  13. 34
  14. 83
  15. 73
  16. 102
  17. 53
  18. 62
  19. 146
  20. 24
  21. 106
  22. 43
  23. 52
  24. 170
  25. 87
  26. 164
  27. 184
  28. 80
  29. 32
  30. 55
  31. 178
  32. 91
  33. 88
  34. 50
  35. 126
  36. 63
  37. 82
  38. 74
  39. 30
  40. 94

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