← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 728 · 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 41 =
  2. 2.Half of 126 =
  3. 3.Double 51 =
  4. 4.Double 24 =
  5. 5.Double 18 =
  6. 6.Double 34 =
  7. 7.Double 36 =
  8. 8.Half of 164 =
  9. 9.Half of 56 =
  10. 10.Double 26 =
  11. 11.Double 71 =
  12. 12.Half of 136 =
  13. 13.Double 16 =
  14. 14.Half of 132 =
  15. 15.Double 21 =
  16. 16.Half of 122 =
  17. 17.Double 55 =
  18. 18.Double 78 =
  19. 19.Double 22 =
  20. 20.Double 94 =
  21. 21.Half of 152 =
  22. 22.Half of 102 =
  23. 23.Half of 198 =
  24. 24.Double 37 =
  25. 25.Half of 72 =
  26. 26.Double 99 =
  27. 27.Half of 124 =
  28. 28.Half of 182 =
  29. 29.Half of 130 =
  30. 30.Double 47 =
  31. 31.Half of 32 =
  32. 32.Double 17 =
  33. 33.Double 33 =
  34. 34.Half of 186 =
  35. 35.Half of 138 =
  36. 36.Double 56 =
  37. 37.Half of 116 =
  38. 38.Double 88 =
  39. 39.Double 81 =
  40. 40.Half of 148 =

Answer key

  1. 82
  2. 63
  3. 102
  4. 48
  5. 36
  6. 68
  7. 72
  8. 82
  9. 28
  10. 52
  11. 142
  12. 68
  13. 32
  14. 66
  15. 42
  16. 61
  17. 110
  18. 156
  19. 44
  20. 188
  21. 76
  22. 51
  23. 99
  24. 74
  25. 36
  26. 198
  27. 62
  28. 91
  29. 65
  30. 94
  31. 16
  32. 34
  33. 66
  34. 93
  35. 69
  36. 112
  37. 58
  38. 176
  39. 162
  40. 74

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