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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 800 · 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 31 =
  2. 2.Double 35 =
  3. 3.Half of 72 =
  4. 4.Half of 118 =
  5. 5.Half of 38 =
  6. 6.Double 36 =
  7. 7.Double 49 =
  8. 8.Double 57 =
  9. 9.Half of 42 =
  10. 10.Half of 84 =
  11. 11.Double 43 =
  12. 12.Half of 88 =
  13. 13.Double 41 =
  14. 14.Half of 62 =
  15. 15.Double 91 =
  16. 16.Half of 90 =
  17. 17.Half of 132 =
  18. 18.Half of 30 =
  19. 19.Double 68 =
  20. 20.Half of 58 =
  21. 21.Double 24 =
  22. 22.Double 88 =
  23. 23.Half of 140 =
  24. 24.Half of 70 =
  25. 25.Half of 110 =
  26. 26.Half of 104 =
  27. 27.Half of 162 =
  28. 28.Half of 54 =
  29. 29.Half of 146 =
  30. 30.Double 32 =
  31. 31.Half of 44 =
  32. 32.Half of 34 =
  33. 33.Double 27 =
  34. 34.Double 51 =
  35. 35.Double 59 =
  36. 36.Double 54 =
  37. 37.Half of 92 =
  38. 38.Half of 194 =
  39. 39.Double 87 =
  40. 40.Half of 28 =

Answer key

  1. 62
  2. 70
  3. 36
  4. 59
  5. 19
  6. 72
  7. 98
  8. 114
  9. 21
  10. 42
  11. 86
  12. 44
  13. 82
  14. 31
  15. 182
  16. 45
  17. 66
  18. 15
  19. 136
  20. 29
  21. 48
  22. 176
  23. 70
  24. 35
  25. 55
  26. 52
  27. 81
  28. 27
  29. 73
  30. 64
  31. 22
  32. 17
  33. 54
  34. 102
  35. 118
  36. 108
  37. 46
  38. 97
  39. 174
  40. 14

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