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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 506 · 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 74 =
  2. 2.Double 35 =
  3. 3.Double 93 =
  4. 4.Half of 70 =
  5. 5.Double 82 =
  6. 6.Double 58 =
  7. 7.Double 75 =
  8. 8.Half of 66 =
  9. 9.Half of 74 =
  10. 10.Double 84 =
  11. 11.Half of 98 =
  12. 12.Double 99 =
  13. 13.Half of 28 =
  14. 14.Double 68 =
  15. 15.Double 16 =
  16. 16.Double 55 =
  17. 17.Double 24 =
  18. 18.Double 88 =
  19. 19.Half of 140 =
  20. 20.Double 45 =
  21. 21.Double 33 =
  22. 22.Half of 68 =
  23. 23.Double 63 =
  24. 24.Double 56 =
  25. 25.Double 17 =
  26. 26.Half of 116 =
  27. 27.Half of 172 =
  28. 28.Double 67 =
  29. 29.Double 21 =
  30. 30.Double 28 =
  31. 31.Half of 78 =
  32. 32.Double 54 =
  33. 33.Double 47 =
  34. 34.Double 27 =
  35. 35.Half of 178 =
  36. 36.Half of 128 =
  37. 37.Half of 110 =
  38. 38.Double 98 =
  39. 39.Half of 50 =
  40. 40.Double 69 =

Answer key

  1. 148
  2. 70
  3. 186
  4. 35
  5. 164
  6. 116
  7. 150
  8. 33
  9. 37
  10. 168
  11. 49
  12. 198
  13. 14
  14. 136
  15. 32
  16. 110
  17. 48
  18. 176
  19. 70
  20. 90
  21. 66
  22. 34
  23. 126
  24. 112
  25. 34
  26. 58
  27. 86
  28. 134
  29. 42
  30. 56
  31. 39
  32. 108
  33. 94
  34. 54
  35. 89
  36. 64
  37. 55
  38. 196
  39. 25
  40. 138

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