← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 535 · 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 82 =
  2. 2.Half of 42 =
  3. 3.Double 16 =
  4. 4.Double 43 =
  5. 5.Half of 144 =
  6. 6.Half of 142 =
  7. 7.Double 21 =
  8. 8.Double 91 =
  9. 9.Double 26 =
  10. 10.Half of 176 =
  11. 11.Half of 116 =
  12. 12.Double 29 =
  13. 13.Half of 72 =
  14. 14.Half of 26 =
  15. 15.Half of 36 =
  16. 16.Double 47 =
  17. 17.Double 24 =
  18. 18.Double 86 =
  19. 19.Half of 122 =
  20. 20.Half of 110 =
  21. 21.Double 31 =
  22. 22.Half of 56 =
  23. 23.Half of 64 =
  24. 24.Double 41 =
  25. 25.Half of 80 =
  26. 26.Double 28 =
  27. 27.Half of 126 =
  28. 28.Half of 60 =
  29. 29.Half of 48 =
  30. 30.Half of 140 =
  31. 31.Half of 94 =
  32. 32.Double 72 =
  33. 33.Half of 162 =
  34. 34.Double 53 =
  35. 35.Double 61 =
  36. 36.Half of 164 =
  37. 37.Half of 66 =
  38. 38.Double 71 =
  39. 39.Double 18 =
  40. 40.Half of 104 =

Answer key

  1. 164
  2. 21
  3. 32
  4. 86
  5. 72
  6. 71
  7. 42
  8. 182
  9. 52
  10. 88
  11. 58
  12. 58
  13. 36
  14. 13
  15. 18
  16. 94
  17. 48
  18. 172
  19. 61
  20. 55
  21. 62
  22. 28
  23. 32
  24. 82
  25. 40
  26. 56
  27. 63
  28. 30
  29. 24
  30. 70
  31. 47
  32. 144
  33. 81
  34. 106
  35. 122
  36. 82
  37. 33
  38. 142
  39. 36
  40. 52

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths