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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 248 · 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 35 =
  2. 2.Double 74 =
  3. 3.Half of 40 =
  4. 4.Half of 74 =
  5. 5.Double 36 =
  6. 6.Double 95 =
  7. 7.Double 67 =
  8. 8.Half of 110 =
  9. 9.Half of 130 =
  10. 10.Half of 82 =
  11. 11.Double 68 =
  12. 12.Double 73 =
  13. 13.Double 51 =
  14. 14.Half of 72 =
  15. 15.Half of 192 =
  16. 16.Double 62 =
  17. 17.Half of 62 =
  18. 18.Double 42 =
  19. 19.Half of 104 =
  20. 20.Half of 176 =
  21. 21.Half of 162 =
  22. 22.Double 27 =
  23. 23.Double 38 =
  24. 24.Double 93 =
  25. 25.Double 44 =
  26. 26.Double 37 =
  27. 27.Half of 28 =
  28. 28.Double 24 =
  29. 29.Half of 46 =
  30. 30.Half of 38 =
  31. 31.Double 99 =
  32. 32.Double 97 =
  33. 33.Half of 116 =
  34. 34.Double 16 =
  35. 35.Half of 68 =
  36. 36.Double 23 =
  37. 37.Half of 132 =
  38. 38.Double 82 =
  39. 39.Double 54 =
  40. 40.Double 94 =

Answer key

  1. 70
  2. 148
  3. 20
  4. 37
  5. 72
  6. 190
  7. 134
  8. 55
  9. 65
  10. 41
  11. 136
  12. 146
  13. 102
  14. 36
  15. 96
  16. 124
  17. 31
  18. 84
  19. 52
  20. 88
  21. 81
  22. 54
  23. 76
  24. 186
  25. 88
  26. 74
  27. 14
  28. 48
  29. 23
  30. 19
  31. 198
  32. 194
  33. 58
  34. 32
  35. 34
  36. 46
  37. 66
  38. 164
  39. 108
  40. 188

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