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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 38 · 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 98 =
  2. 2.Double 86 =
  3. 3.Half of 32 =
  4. 4.Double 69 =
  5. 5.Half of 78 =
  6. 6.Half of 26 =
  7. 7.Double 17 =
  8. 8.Half of 184 =
  9. 9.Half of 94 =
  10. 10.Half of 162 =
  11. 11.Half of 178 =
  12. 12.Double 31 =
  13. 13.Double 21 =
  14. 14.Double 76 =
  15. 15.Half of 110 =
  16. 16.Double 87 =
  17. 17.Half of 36 =
  18. 18.Double 65 =
  19. 19.Half of 156 =
  20. 20.Double 89 =
  21. 21.Half of 198 =
  22. 22.Double 45 =
  23. 23.Double 72 =
  24. 24.Half of 134 =
  25. 25.Half of 28 =
  26. 26.Double 58 =
  27. 27.Double 36 =
  28. 28.Double 53 =
  29. 29.Double 24 =
  30. 30.Double 47 =
  31. 31.Double 57 =
  32. 32.Half of 108 =
  33. 33.Double 32 =
  34. 34.Half of 142 =
  35. 35.Half of 60 =
  36. 36.Half of 128 =
  37. 37.Double 79 =
  38. 38.Double 55 =
  39. 39.Half of 100 =
  40. 40.Double 34 =

Answer key

  1. 196
  2. 172
  3. 16
  4. 138
  5. 39
  6. 13
  7. 34
  8. 92
  9. 47
  10. 81
  11. 89
  12. 62
  13. 42
  14. 152
  15. 55
  16. 174
  17. 18
  18. 130
  19. 78
  20. 178
  21. 99
  22. 90
  23. 144
  24. 67
  25. 14
  26. 116
  27. 72
  28. 106
  29. 48
  30. 94
  31. 114
  32. 54
  33. 64
  34. 71
  35. 30
  36. 64
  37. 158
  38. 110
  39. 50
  40. 68

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