← Doubling and halving lesson New set →

Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 624 · 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 72 =
  2. 2.Half of 56 =
  3. 3.Double 31 =
  4. 4.Double 66 =
  5. 5.Half of 140 =
  6. 6.Double 99 =
  7. 7.Half of 26 =
  8. 8.Half of 62 =
  9. 9.Double 33 =
  10. 10.Half of 34 =
  11. 11.Double 91 =
  12. 12.Double 61 =
  13. 13.Half of 134 =
  14. 14.Half of 70 =
  15. 15.Half of 184 =
  16. 16.Half of 128 =
  17. 17.Double 59 =
  18. 18.Double 63 =
  19. 19.Half of 94 =
  20. 20.Half of 98 =
  21. 21.Double 74 =
  22. 22.Double 71 =
  23. 23.Double 53 =
  24. 24.Half of 142 =
  25. 25.Double 88 =
  26. 26.Half of 154 =
  27. 27.Half of 40 =
  28. 28.Half of 44 =
  29. 29.Half of 166 =
  30. 30.Half of 170 =
  31. 31.Double 28 =
  32. 32.Double 52 =
  33. 33.Half of 116 =
  34. 34.Double 21 =
  35. 35.Double 65 =
  36. 36.Double 97 =
  37. 37.Half of 64 =
  38. 38.Double 58 =
  39. 39.Half of 198 =
  40. 40.Double 87 =

Answer key

  1. 36
  2. 28
  3. 62
  4. 132
  5. 70
  6. 198
  7. 13
  8. 31
  9. 66
  10. 17
  11. 182
  12. 122
  13. 67
  14. 35
  15. 92
  16. 64
  17. 118
  18. 126
  19. 47
  20. 49
  21. 148
  22. 142
  23. 106
  24. 71
  25. 176
  26. 77
  27. 20
  28. 22
  29. 83
  30. 85
  31. 56
  32. 104
  33. 58
  34. 42
  35. 130
  36. 194
  37. 32
  38. 116
  39. 99
  40. 174

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