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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 411 · 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 32 =
  2. 2.Half of 94 =
  3. 3.Double 79 =
  4. 4.Half of 198 =
  5. 5.Double 52 =
  6. 6.Half of 156 =
  7. 7.Double 59 =
  8. 8.Half of 96 =
  9. 9.Half of 52 =
  10. 10.Half of 50 =
  11. 11.Double 24 =
  12. 12.Half of 184 =
  13. 13.Double 56 =
  14. 14.Double 94 =
  15. 15.Double 36 =
  16. 16.Half of 114 =
  17. 17.Double 76 =
  18. 18.Half of 58 =
  19. 19.Double 54 =
  20. 20.Double 64 =
  21. 21.Half of 180 =
  22. 22.Double 47 =
  23. 23.Half of 92 =
  24. 24.Half of 164 =
  25. 25.Half of 126 =
  26. 26.Half of 190 =
  27. 27.Double 18 =
  28. 28.Double 69 =
  29. 29.Half of 104 =
  30. 30.Half of 162 =
  31. 31.Half of 56 =
  32. 32.Double 98 =
  33. 33.Double 84 =
  34. 34.Double 97 =
  35. 35.Double 68 =
  36. 36.Half of 160 =
  37. 37.Half of 188 =
  38. 38.Half of 108 =
  39. 39.Half of 84 =
  40. 40.Double 23 =

Answer key

  1. 16
  2. 47
  3. 158
  4. 99
  5. 104
  6. 78
  7. 118
  8. 48
  9. 26
  10. 25
  11. 48
  12. 92
  13. 112
  14. 188
  15. 72
  16. 57
  17. 152
  18. 29
  19. 108
  20. 128
  21. 90
  22. 94
  23. 46
  24. 82
  25. 63
  26. 95
  27. 36
  28. 138
  29. 52
  30. 81
  31. 28
  32. 196
  33. 168
  34. 194
  35. 136
  36. 80
  37. 94
  38. 54
  39. 42
  40. 46

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