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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 259 · 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 41 =
  2. 2.Half of 48 =
  3. 3.Double 35 =
  4. 4.Half of 74 =
  5. 5.Double 46 =
  6. 6.Double 52 =
  7. 7.Half of 180 =
  8. 8.Double 91 =
  9. 9.Double 23 =
  10. 10.Double 73 =
  11. 11.Half of 166 =
  12. 12.Double 53 =
  13. 13.Half of 64 =
  14. 14.Half of 196 =
  15. 15.Half of 40 =
  16. 16.Half of 60 =
  17. 17.Half of 28 =
  18. 18.Half of 124 =
  19. 19.Double 24 =
  20. 20.Double 77 =
  21. 21.Double 51 =
  22. 22.Half of 66 =
  23. 23.Half of 52 =
  24. 24.Double 97 =
  25. 25.Double 32 =
  26. 26.Half of 176 =
  27. 27.Double 45 =
  28. 28.Half of 128 =
  29. 29.Double 31 =
  30. 30.Half of 70 =
  31. 31.Half of 76 =
  32. 32.Double 83 =
  33. 33.Double 86 =
  34. 34.Double 57 =
  35. 35.Half of 126 =
  36. 36.Double 79 =
  37. 37.Double 99 =
  38. 38.Double 63 =
  39. 39.Double 84 =
  40. 40.Double 93 =

Answer key

  1. 82
  2. 24
  3. 70
  4. 37
  5. 92
  6. 104
  7. 90
  8. 182
  9. 46
  10. 146
  11. 83
  12. 106
  13. 32
  14. 98
  15. 20
  16. 30
  17. 14
  18. 62
  19. 48
  20. 154
  21. 102
  22. 33
  23. 26
  24. 194
  25. 64
  26. 88
  27. 90
  28. 64
  29. 62
  30. 35
  31. 38
  32. 166
  33. 172
  34. 114
  35. 63
  36. 158
  37. 198
  38. 126
  39. 168
  40. 186

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