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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 541 · 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 17 =
  2. 2.Half of 72 =
  3. 3.Half of 156 =
  4. 4.Half of 198 =
  5. 5.Double 25 =
  6. 6.Double 66 =
  7. 7.Double 74 =
  8. 8.Half of 166 =
  9. 9.Double 27 =
  10. 10.Double 42 =
  11. 11.Half of 118 =
  12. 12.Double 95 =
  13. 13.Half of 126 =
  14. 14.Double 35 =
  15. 15.Half of 28 =
  16. 16.Double 69 =
  17. 17.Double 16 =
  18. 18.Double 21 =
  19. 19.Half of 32 =
  20. 20.Half of 184 =
  21. 21.Half of 142 =
  22. 22.Double 81 =
  23. 23.Double 44 =
  24. 24.Half of 74 =
  25. 25.Double 28 =
  26. 26.Double 39 =
  27. 27.Half of 50 =
  28. 28.Double 92 =
  29. 29.Double 94 =
  30. 30.Half of 182 =
  31. 31.Double 31 =
  32. 32.Half of 112 =
  33. 33.Half of 104 =
  34. 34.Half of 66 =
  35. 35.Double 88 =
  36. 36.Half of 90 =
  37. 37.Half of 176 =
  38. 38.Double 18 =
  39. 39.Half of 60 =
  40. 40.Double 22 =

Answer key

  1. 34
  2. 36
  3. 78
  4. 99
  5. 50
  6. 132
  7. 148
  8. 83
  9. 54
  10. 84
  11. 59
  12. 190
  13. 63
  14. 70
  15. 14
  16. 138
  17. 32
  18. 42
  19. 16
  20. 92
  21. 71
  22. 162
  23. 88
  24. 37
  25. 56
  26. 78
  27. 25
  28. 184
  29. 188
  30. 91
  31. 62
  32. 56
  33. 52
  34. 33
  35. 176
  36. 45
  37. 88
  38. 36
  39. 30
  40. 44

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