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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 689 · 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 31 =
  2. 2.Double 83 =
  3. 3.Double 17 =
  4. 4.Half of 50 =
  5. 5.Double 98 =
  6. 6.Half of 28 =
  7. 7.Double 28 =
  8. 8.Double 32 =
  9. 9.Double 37 =
  10. 10.Double 38 =
  11. 11.Half of 142 =
  12. 12.Double 84 =
  13. 13.Half of 162 =
  14. 14.Double 18 =
  15. 15.Half of 60 =
  16. 16.Double 26 =
  17. 17.Half of 46 =
  18. 18.Double 23 =
  19. 19.Double 29 =
  20. 20.Half of 94 =
  21. 21.Half of 112 =
  22. 22.Half of 44 =
  23. 23.Half of 42 =
  24. 24.Half of 48 =
  25. 25.Half of 26 =
  26. 26.Double 35 =
  27. 27.Double 77 =
  28. 28.Double 85 =
  29. 29.Double 97 =
  30. 30.Half of 170 =
  31. 31.Half of 86 =
  32. 32.Double 64 =
  33. 33.Double 79 =
  34. 34.Half of 156 =
  35. 35.Half of 154 =
  36. 36.Half of 138 =
  37. 37.Half of 58 =
  38. 38.Half of 172 =
  39. 39.Half of 72 =
  40. 40.Half of 176 =

Answer key

  1. 62
  2. 166
  3. 34
  4. 25
  5. 196
  6. 14
  7. 56
  8. 64
  9. 74
  10. 76
  11. 71
  12. 168
  13. 81
  14. 36
  15. 30
  16. 52
  17. 23
  18. 46
  19. 58
  20. 47
  21. 56
  22. 22
  23. 21
  24. 24
  25. 13
  26. 70
  27. 154
  28. 170
  29. 194
  30. 85
  31. 43
  32. 128
  33. 158
  34. 78
  35. 77
  36. 69
  37. 29
  38. 86
  39. 36
  40. 88

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