← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 635 · 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 89 =
  2. 2.Half of 62 =
  3. 3.Double 25 =
  4. 4.Half of 60 =
  5. 5.Half of 58 =
  6. 6.Double 19 =
  7. 7.Half of 54 =
  8. 8.Double 81 =
  9. 9.Half of 76 =
  10. 10.Double 37 =
  11. 11.Double 68 =
  12. 12.Half of 48 =
  13. 13.Double 49 =
  14. 14.Double 58 =
  15. 15.Double 96 =
  16. 16.Double 42 =
  17. 17.Half of 64 =
  18. 18.Double 98 =
  19. 19.Half of 130 =
  20. 20.Double 62 =
  21. 21.Double 87 =
  22. 22.Half of 44 =
  23. 23.Double 55 =
  24. 24.Half of 128 =
  25. 25.Double 22 =
  26. 26.Half of 80 =
  27. 27.Half of 36 =
  28. 28.Half of 144 =
  29. 29.Double 83 =
  30. 30.Double 21 =
  31. 31.Double 33 =
  32. 32.Half of 176 =
  33. 33.Half of 32 =
  34. 34.Half of 42 =
  35. 35.Double 43 =
  36. 36.Double 61 =
  37. 37.Double 95 =
  38. 38.Double 64 =
  39. 39.Double 27 =
  40. 40.Double 24 =

Answer key

  1. 178
  2. 31
  3. 50
  4. 30
  5. 29
  6. 38
  7. 27
  8. 162
  9. 38
  10. 74
  11. 136
  12. 24
  13. 98
  14. 116
  15. 192
  16. 84
  17. 32
  18. 196
  19. 65
  20. 124
  21. 174
  22. 22
  23. 110
  24. 64
  25. 44
  26. 40
  27. 18
  28. 72
  29. 166
  30. 42
  31. 66
  32. 88
  33. 16
  34. 21
  35. 86
  36. 122
  37. 190
  38. 128
  39. 54
  40. 48

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