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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 372 · 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 87 =
  2. 2.Half of 78 =
  3. 3.Half of 60 =
  4. 4.Half of 140 =
  5. 5.Double 81 =
  6. 6.Double 76 =
  7. 7.Double 21 =
  8. 8.Double 92 =
  9. 9.Half of 112 =
  10. 10.Half of 138 =
  11. 11.Double 42 =
  12. 12.Double 31 =
  13. 13.Half of 32 =
  14. 14.Half of 182 =
  15. 15.Half of 76 =
  16. 16.Double 58 =
  17. 17.Half of 80 =
  18. 18.Double 89 =
  19. 19.Double 16 =
  20. 20.Half of 36 =
  21. 21.Half of 100 =
  22. 22.Half of 188 =
  23. 23.Double 17 =
  24. 24.Double 23 =
  25. 25.Half of 50 =
  26. 26.Half of 38 =
  27. 27.Half of 104 =
  28. 28.Half of 134 =
  29. 29.Half of 170 =
  30. 30.Double 93 =
  31. 31.Double 33 =
  32. 32.Half of 62 =
  33. 33.Double 65 =
  34. 34.Half of 196 =
  35. 35.Double 18 =
  36. 36.Double 22 =
  37. 37.Half of 66 =
  38. 38.Double 91 =
  39. 39.Double 56 =
  40. 40.Half of 108 =

Answer key

  1. 174
  2. 39
  3. 30
  4. 70
  5. 162
  6. 152
  7. 42
  8. 184
  9. 56
  10. 69
  11. 84
  12. 62
  13. 16
  14. 91
  15. 38
  16. 116
  17. 40
  18. 178
  19. 32
  20. 18
  21. 50
  22. 94
  23. 34
  24. 46
  25. 25
  26. 19
  27. 52
  28. 67
  29. 85
  30. 186
  31. 66
  32. 31
  33. 130
  34. 98
  35. 36
  36. 44
  37. 33
  38. 182
  39. 112
  40. 54

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