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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 916 · 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 63 =
  2. 2.Half of 112 =
  3. 3.Half of 176 =
  4. 4.Half of 96 =
  5. 5.Double 51 =
  6. 6.Double 84 =
  7. 7.Double 54 =
  8. 8.Double 67 =
  9. 9.Double 39 =
  10. 10.Half of 104 =
  11. 11.Half of 146 =
  12. 12.Double 62 =
  13. 13.Double 23 =
  14. 14.Half of 160 =
  15. 15.Double 29 =
  16. 16.Double 38 =
  17. 17.Double 33 =
  18. 18.Double 37 =
  19. 19.Half of 84 =
  20. 20.Double 76 =
  21. 21.Double 66 =
  22. 22.Half of 190 =
  23. 23.Double 97 =
  24. 24.Half of 198 =
  25. 25.Double 71 =
  26. 26.Half of 44 =
  27. 27.Half of 26 =
  28. 28.Double 24 =
  29. 29.Double 32 =
  30. 30.Double 81 =
  31. 31.Double 36 =
  32. 32.Double 59 =
  33. 33.Double 18 =
  34. 34.Half of 140 =
  35. 35.Double 96 =
  36. 36.Half of 64 =
  37. 37.Half of 54 =
  38. 38.Half of 166 =
  39. 39.Double 21 =
  40. 40.Double 27 =

Answer key

  1. 126
  2. 56
  3. 88
  4. 48
  5. 102
  6. 168
  7. 108
  8. 134
  9. 78
  10. 52
  11. 73
  12. 124
  13. 46
  14. 80
  15. 58
  16. 76
  17. 66
  18. 74
  19. 42
  20. 152
  21. 132
  22. 95
  23. 194
  24. 99
  25. 142
  26. 22
  27. 13
  28. 48
  29. 64
  30. 162
  31. 72
  32. 118
  33. 36
  34. 70
  35. 192
  36. 32
  37. 27
  38. 83
  39. 42
  40. 54

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