← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 695 · 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 57 =
  2. 2.Half of 102 =
  3. 3.Half of 46 =
  4. 4.Double 51 =
  5. 5.Half of 120 =
  6. 6.Double 35 =
  7. 7.Half of 56 =
  8. 8.Half of 118 =
  9. 9.Half of 26 =
  10. 10.Double 61 =
  11. 11.Half of 94 =
  12. 12.Double 21 =
  13. 13.Half of 60 =
  14. 14.Half of 110 =
  15. 15.Half of 52 =
  16. 16.Half of 136 =
  17. 17.Double 18 =
  18. 18.Half of 92 =
  19. 19.Half of 38 =
  20. 20.Double 96 =
  21. 21.Double 56 =
  22. 22.Double 72 =
  23. 23.Half of 132 =
  24. 24.Double 93 =
  25. 25.Double 22 =
  26. 26.Half of 74 =
  27. 27.Double 89 =
  28. 28.Half of 48 =
  29. 29.Double 75 =
  30. 30.Double 37 =
  31. 31.Double 84 =
  32. 32.Double 87 =
  33. 33.Double 79 =
  34. 34.Double 83 =
  35. 35.Half of 68 =
  36. 36.Double 58 =
  37. 37.Double 41 =
  38. 38.Double 73 =
  39. 39.Half of 160 =
  40. 40.Double 26 =

Answer key

  1. 114
  2. 51
  3. 23
  4. 102
  5. 60
  6. 70
  7. 28
  8. 59
  9. 13
  10. 122
  11. 47
  12. 42
  13. 30
  14. 55
  15. 26
  16. 68
  17. 36
  18. 46
  19. 19
  20. 192
  21. 112
  22. 144
  23. 66
  24. 186
  25. 44
  26. 37
  27. 178
  28. 24
  29. 150
  30. 74
  31. 168
  32. 174
  33. 158
  34. 166
  35. 34
  36. 116
  37. 82
  38. 146
  39. 80
  40. 52

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