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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 830 · 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 37 =
  2. 2.Double 91 =
  3. 3.Half of 96 =
  4. 4.Half of 26 =
  5. 5.Double 23 =
  6. 6.Double 82 =
  7. 7.Double 32 =
  8. 8.Double 44 =
  9. 9.Half of 86 =
  10. 10.Double 77 =
  11. 11.Half of 98 =
  12. 12.Half of 72 =
  13. 13.Double 53 =
  14. 14.Half of 28 =
  15. 15.Half of 160 =
  16. 16.Double 74 =
  17. 17.Double 24 =
  18. 18.Double 67 =
  19. 19.Half of 154 =
  20. 20.Double 62 =
  21. 21.Double 46 =
  22. 22.Double 57 =
  23. 23.Double 49 =
  24. 24.Double 84 =
  25. 25.Half of 48 =
  26. 26.Double 25 =
  27. 27.Half of 36 =
  28. 28.Half of 148 =
  29. 29.Double 21 =
  30. 30.Double 87 =
  31. 31.Half of 76 =
  32. 32.Half of 110 =
  33. 33.Double 16 =
  34. 34.Half of 30 =
  35. 35.Double 35 =
  36. 36.Double 61 =
  37. 37.Double 17 =
  38. 38.Half of 136 =
  39. 39.Double 97 =
  40. 40.Half of 80 =

Answer key

  1. 74
  2. 182
  3. 48
  4. 13
  5. 46
  6. 164
  7. 64
  8. 88
  9. 43
  10. 154
  11. 49
  12. 36
  13. 106
  14. 14
  15. 80
  16. 148
  17. 48
  18. 134
  19. 77
  20. 124
  21. 92
  22. 114
  23. 98
  24. 168
  25. 24
  26. 50
  27. 18
  28. 74
  29. 42
  30. 174
  31. 38
  32. 55
  33. 32
  34. 15
  35. 70
  36. 122
  37. 34
  38. 68
  39. 194
  40. 40

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