← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 166 · 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.Half of 166 =
  2. 2.Half of 120 =
  3. 3.Double 21 =
  4. 4.Half of 170 =
  5. 5.Half of 72 =
  6. 6.Half of 162 =
  7. 7.Half of 174 =
  8. 8.Double 41 =
  9. 9.Double 92 =
  10. 10.Half of 80 =
  11. 11.Half of 70 =
  12. 12.Half of 58 =
  13. 13.Half of 84 =
  14. 14.Half of 110 =
  15. 15.Double 34 =
  16. 16.Double 71 =
  17. 17.Half of 66 =
  18. 18.Double 56 =
  19. 19.Double 68 =
  20. 20.Half of 142 =
  21. 21.Double 44 =
  22. 22.Double 91 =
  23. 23.Double 74 =
  24. 24.Double 25 =
  25. 25.Half of 46 =
  26. 26.Double 84 =
  27. 27.Double 31 =
  28. 28.Half of 102 =
  29. 29.Half of 156 =
  30. 30.Half of 28 =
  31. 31.Double 32 =
  32. 32.Double 33 =
  33. 33.Double 22 =
  34. 34.Double 17 =
  35. 35.Double 65 =
  36. 36.Double 35 =
  37. 37.Half of 128 =
  38. 38.Half of 196 =
  39. 39.Half of 86 =
  40. 40.Double 63 =

Answer key

  1. 83
  2. 60
  3. 42
  4. 85
  5. 36
  6. 81
  7. 87
  8. 82
  9. 184
  10. 40
  11. 35
  12. 29
  13. 42
  14. 55
  15. 68
  16. 142
  17. 33
  18. 112
  19. 136
  20. 71
  21. 88
  22. 182
  23. 148
  24. 50
  25. 23
  26. 168
  27. 62
  28. 51
  29. 78
  30. 14
  31. 64
  32. 66
  33. 44
  34. 34
  35. 130
  36. 70
  37. 64
  38. 98
  39. 43
  40. 126

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