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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 777 · 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 68 =
  2. 2.Double 43 =
  3. 3.Double 53 =
  4. 4.Half of 150 =
  5. 5.Half of 190 =
  6. 6.Double 16 =
  7. 7.Half of 40 =
  8. 8.Half of 96 =
  9. 9.Double 92 =
  10. 10.Double 42 =
  11. 11.Half of 50 =
  12. 12.Double 31 =
  13. 13.Double 83 =
  14. 14.Half of 146 =
  15. 15.Double 44 =
  16. 16.Double 77 =
  17. 17.Half of 126 =
  18. 18.Double 21 =
  19. 19.Half of 188 =
  20. 20.Half of 170 =
  21. 21.Double 35 =
  22. 22.Half of 194 =
  23. 23.Double 58 =
  24. 24.Double 28 =
  25. 25.Half of 88 =
  26. 26.Half of 52 =
  27. 27.Half of 98 =
  28. 28.Half of 42 =
  29. 29.Half of 106 =
  30. 30.Double 24 =
  31. 31.Half of 68 =
  32. 32.Double 55 =
  33. 33.Double 71 =
  34. 34.Double 25 =
  35. 35.Double 49 =
  36. 36.Half of 196 =
  37. 37.Half of 140 =
  38. 38.Double 89 =
  39. 39.Double 62 =
  40. 40.Double 17 =

Answer key

  1. 136
  2. 86
  3. 106
  4. 75
  5. 95
  6. 32
  7. 20
  8. 48
  9. 184
  10. 84
  11. 25
  12. 62
  13. 166
  14. 73
  15. 88
  16. 154
  17. 63
  18. 42
  19. 94
  20. 85
  21. 70
  22. 97
  23. 116
  24. 56
  25. 44
  26. 26
  27. 49
  28. 21
  29. 53
  30. 48
  31. 34
  32. 110
  33. 142
  34. 50
  35. 98
  36. 98
  37. 70
  38. 178
  39. 124
  40. 34

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