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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 451 · 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 118 =
  2. 2.Half of 166 =
  3. 3.Half of 86 =
  4. 4.Double 68 =
  5. 5.Half of 140 =
  6. 6.Double 96 =
  7. 7.Half of 182 =
  8. 8.Double 91 =
  9. 9.Double 48 =
  10. 10.Half of 76 =
  11. 11.Half of 186 =
  12. 12.Half of 94 =
  13. 13.Half of 132 =
  14. 14.Half of 184 =
  15. 15.Double 98 =
  16. 16.Half of 160 =
  17. 17.Double 16 =
  18. 18.Double 41 =
  19. 19.Double 63 =
  20. 20.Half of 172 =
  21. 21.Double 22 =
  22. 22.Half of 38 =
  23. 23.Double 36 =
  24. 24.Half of 98 =
  25. 25.Double 33 =
  26. 26.Double 47 =
  27. 27.Half of 192 =
  28. 28.Double 67 =
  29. 29.Double 42 =
  30. 30.Half of 34 =
  31. 31.Double 75 =
  32. 32.Double 31 =
  33. 33.Double 76 =
  34. 34.Half of 50 =
  35. 35.Half of 142 =
  36. 36.Half of 100 =
  37. 37.Double 79 =
  38. 38.Double 35 =
  39. 39.Half of 30 =
  40. 40.Half of 82 =

Answer key

  1. 59
  2. 83
  3. 43
  4. 136
  5. 70
  6. 192
  7. 91
  8. 182
  9. 96
  10. 38
  11. 93
  12. 47
  13. 66
  14. 92
  15. 196
  16. 80
  17. 32
  18. 82
  19. 126
  20. 86
  21. 44
  22. 19
  23. 72
  24. 49
  25. 66
  26. 94
  27. 96
  28. 134
  29. 84
  30. 17
  31. 150
  32. 62
  33. 152
  34. 25
  35. 71
  36. 50
  37. 158
  38. 70
  39. 15
  40. 41

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