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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 621 · 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 36 =
  2. 2.Half of 66 =
  3. 3.Half of 152 =
  4. 4.Double 23 =
  5. 5.Double 16 =
  6. 6.Double 66 =
  7. 7.Double 37 =
  8. 8.Double 98 =
  9. 9.Half of 176 =
  10. 10.Half of 68 =
  11. 11.Double 33 =
  12. 12.Half of 44 =
  13. 13.Double 35 =
  14. 14.Half of 156 =
  15. 15.Double 34 =
  16. 16.Half of 166 =
  17. 17.Double 72 =
  18. 18.Double 18 =
  19. 19.Half of 168 =
  20. 20.Double 21 =
  21. 21.Double 68 =
  22. 22.Half of 104 =
  23. 23.Half of 58 =
  24. 24.Double 74 =
  25. 25.Double 29 =
  26. 26.Double 77 =
  27. 27.Half of 164 =
  28. 28.Half of 182 =
  29. 29.Half of 148 =
  30. 30.Double 41 =
  31. 31.Half of 84 =
  32. 32.Double 91 =
  33. 33.Double 27 =
  34. 34.Double 85 =
  35. 35.Half of 198 =
  36. 36.Double 95 =
  37. 37.Half of 118 =
  38. 38.Half of 144 =
  39. 39.Half of 172 =
  40. 40.Half of 132 =

Answer key

  1. 72
  2. 33
  3. 76
  4. 46
  5. 32
  6. 132
  7. 74
  8. 196
  9. 88
  10. 34
  11. 66
  12. 22
  13. 70
  14. 78
  15. 68
  16. 83
  17. 144
  18. 36
  19. 84
  20. 42
  21. 136
  22. 52
  23. 29
  24. 148
  25. 58
  26. 154
  27. 82
  28. 91
  29. 74
  30. 82
  31. 42
  32. 182
  33. 54
  34. 170
  35. 99
  36. 190
  37. 59
  38. 72
  39. 86
  40. 66

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