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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 880 · 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 24 =
  3. 3.Double 99 =
  4. 4.Half of 56 =
  5. 5.Double 56 =
  6. 6.Double 34 =
  7. 7.Double 67 =
  8. 8.Double 65 =
  9. 9.Double 37 =
  10. 10.Half of 140 =
  11. 11.Half of 166 =
  12. 12.Double 36 =
  13. 13.Half of 96 =
  14. 14.Double 33 =
  15. 15.Double 98 =
  16. 16.Half of 60 =
  17. 17.Half of 176 =
  18. 18.Double 54 =
  19. 19.Half of 80 =
  20. 20.Double 19 =
  21. 21.Double 86 =
  22. 22.Double 29 =
  23. 23.Double 58 =
  24. 24.Half of 148 =
  25. 25.Half of 132 =
  26. 26.Double 93 =
  27. 27.Double 26 =
  28. 28.Double 62 =
  29. 29.Double 96 =
  30. 30.Double 82 =
  31. 31.Half of 100 =
  32. 32.Half of 164 =
  33. 33.Double 85 =
  34. 34.Half of 42 =
  35. 35.Double 18 =
  36. 36.Double 27 =
  37. 37.Double 39 =
  38. 38.Double 57 =
  39. 39.Half of 190 =
  40. 40.Double 68 =

Answer key

  1. 62
  2. 48
  3. 198
  4. 28
  5. 112
  6. 68
  7. 134
  8. 130
  9. 74
  10. 70
  11. 83
  12. 72
  13. 48
  14. 66
  15. 196
  16. 30
  17. 88
  18. 108
  19. 40
  20. 38
  21. 172
  22. 58
  23. 116
  24. 74
  25. 66
  26. 186
  27. 52
  28. 124
  29. 192
  30. 164
  31. 50
  32. 82
  33. 170
  34. 21
  35. 36
  36. 54
  37. 78
  38. 114
  39. 95
  40. 136

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