← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 571 · 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 79 =
  2. 2.Double 75 =
  3. 3.Double 95 =
  4. 4.Half of 80 =
  5. 5.Double 52 =
  6. 6.Half of 44 =
  7. 7.Double 45 =
  8. 8.Half of 26 =
  9. 9.Half of 108 =
  10. 10.Double 74 =
  11. 11.Double 85 =
  12. 12.Double 61 =
  13. 13.Half of 160 =
  14. 14.Half of 98 =
  15. 15.Double 91 =
  16. 16.Double 82 =
  17. 17.Double 58 =
  18. 18.Double 51 =
  19. 19.Double 21 =
  20. 20.Half of 96 =
  21. 21.Double 36 =
  22. 22.Half of 40 =
  23. 23.Half of 174 =
  24. 24.Half of 72 =
  25. 25.Half of 54 =
  26. 26.Half of 58 =
  27. 27.Double 34 =
  28. 28.Double 41 =
  29. 29.Double 76 =
  30. 30.Double 43 =
  31. 31.Double 72 =
  32. 32.Half of 90 =
  33. 33.Half of 106 =
  34. 34.Double 88 =
  35. 35.Half of 154 =
  36. 36.Double 65 =
  37. 37.Double 67 =
  38. 38.Half of 60 =
  39. 39.Double 23 =
  40. 40.Half of 36 =

Answer key

  1. 158
  2. 150
  3. 190
  4. 40
  5. 104
  6. 22
  7. 90
  8. 13
  9. 54
  10. 148
  11. 170
  12. 122
  13. 80
  14. 49
  15. 182
  16. 164
  17. 116
  18. 102
  19. 42
  20. 48
  21. 72
  22. 20
  23. 87
  24. 36
  25. 27
  26. 29
  27. 68
  28. 82
  29. 152
  30. 86
  31. 144
  32. 45
  33. 53
  34. 176
  35. 77
  36. 130
  37. 134
  38. 30
  39. 46
  40. 18

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