← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 521 · 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 62 =
  2. 2.Half of 80 =
  3. 3.Half of 56 =
  4. 4.Half of 170 =
  5. 5.Double 56 =
  6. 6.Double 91 =
  7. 7.Double 75 =
  8. 8.Double 65 =
  9. 9.Half of 72 =
  10. 10.Double 35 =
  11. 11.Half of 144 =
  12. 12.Double 21 =
  13. 13.Half of 188 =
  14. 14.Double 48 =
  15. 15.Double 18 =
  16. 16.Double 99 =
  17. 17.Half of 42 =
  18. 18.Half of 60 =
  19. 19.Double 86 =
  20. 20.Half of 124 =
  21. 21.Double 79 =
  22. 22.Double 85 =
  23. 23.Double 27 =
  24. 24.Half of 88 =
  25. 25.Half of 58 =
  26. 26.Double 92 =
  27. 27.Double 46 =
  28. 28.Half of 98 =
  29. 29.Half of 94 =
  30. 30.Half of 134 =
  31. 31.Half of 50 =
  32. 32.Half of 180 =
  33. 33.Half of 62 =
  34. 34.Half of 38 =
  35. 35.Double 23 =
  36. 36.Half of 36 =
  37. 37.Half of 142 =
  38. 38.Double 72 =
  39. 39.Double 82 =
  40. 40.Half of 48 =

Answer key

  1. 124
  2. 40
  3. 28
  4. 85
  5. 112
  6. 182
  7. 150
  8. 130
  9. 36
  10. 70
  11. 72
  12. 42
  13. 94
  14. 96
  15. 36
  16. 198
  17. 21
  18. 30
  19. 172
  20. 62
  21. 158
  22. 170
  23. 54
  24. 44
  25. 29
  26. 184
  27. 92
  28. 49
  29. 47
  30. 67
  31. 25
  32. 90
  33. 31
  34. 19
  35. 46
  36. 18
  37. 71
  38. 144
  39. 164
  40. 24

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