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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 160 · 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 39 =
  2. 2.Half of 72 =
  3. 3.Half of 190 =
  4. 4.Half of 126 =
  5. 5.Half of 198 =
  6. 6.Half of 128 =
  7. 7.Double 47 =
  8. 8.Double 21 =
  9. 9.Half of 124 =
  10. 10.Double 86 =
  11. 11.Double 32 =
  12. 12.Double 38 =
  13. 13.Half of 96 =
  14. 14.Double 43 =
  15. 15.Half of 140 =
  16. 16.Half of 142 =
  17. 17.Double 41 =
  18. 18.Double 29 =
  19. 19.Double 81 =
  20. 20.Double 72 =
  21. 21.Half of 90 =
  22. 22.Double 31 =
  23. 23.Half of 122 =
  24. 24.Half of 180 =
  25. 25.Double 98 =
  26. 26.Double 69 =
  27. 27.Double 85 =
  28. 28.Half of 40 =
  29. 29.Half of 156 =
  30. 30.Half of 52 =
  31. 31.Double 27 =
  32. 32.Half of 196 =
  33. 33.Half of 34 =
  34. 34.Half of 80 =
  35. 35.Half of 28 =
  36. 36.Double 74 =
  37. 37.Half of 172 =
  38. 38.Half of 26 =
  39. 39.Double 61 =
  40. 40.Double 65 =

Answer key

  1. 78
  2. 36
  3. 95
  4. 63
  5. 99
  6. 64
  7. 94
  8. 42
  9. 62
  10. 172
  11. 64
  12. 76
  13. 48
  14. 86
  15. 70
  16. 71
  17. 82
  18. 58
  19. 162
  20. 144
  21. 45
  22. 62
  23. 61
  24. 90
  25. 196
  26. 138
  27. 170
  28. 20
  29. 78
  30. 26
  31. 54
  32. 98
  33. 17
  34. 40
  35. 14
  36. 148
  37. 86
  38. 13
  39. 122
  40. 130

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