← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 698 · 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 28 =
  2. 2.Half of 154 =
  3. 3.Double 85 =
  4. 4.Double 41 =
  5. 5.Double 36 =
  6. 6.Double 19 =
  7. 7.Double 27 =
  8. 8.Double 45 =
  9. 9.Double 74 =
  10. 10.Double 31 =
  11. 11.Half of 52 =
  12. 12.Double 68 =
  13. 13.Half of 40 =
  14. 14.Double 23 =
  15. 15.Half of 138 =
  16. 16.Double 91 =
  17. 17.Double 46 =
  18. 18.Double 98 =
  19. 19.Half of 142 =
  20. 20.Double 32 =
  21. 21.Half of 44 =
  22. 22.Half of 110 =
  23. 23.Double 77 =
  24. 24.Half of 90 =
  25. 25.Half of 190 =
  26. 26.Half of 168 =
  27. 27.Half of 106 =
  28. 28.Double 94 =
  29. 29.Half of 196 =
  30. 30.Half of 198 =
  31. 31.Double 57 =
  32. 32.Double 58 =
  33. 33.Half of 58 =
  34. 34.Double 48 =
  35. 35.Half of 62 =
  36. 36.Half of 46 =
  37. 37.Double 73 =
  38. 38.Double 99 =
  39. 39.Half of 30 =
  40. 40.Double 33 =

Answer key

  1. 56
  2. 77
  3. 170
  4. 82
  5. 72
  6. 38
  7. 54
  8. 90
  9. 148
  10. 62
  11. 26
  12. 136
  13. 20
  14. 46
  15. 69
  16. 182
  17. 92
  18. 196
  19. 71
  20. 64
  21. 22
  22. 55
  23. 154
  24. 45
  25. 95
  26. 84
  27. 53
  28. 188
  29. 98
  30. 99
  31. 114
  32. 116
  33. 29
  34. 96
  35. 31
  36. 23
  37. 146
  38. 198
  39. 15
  40. 66

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