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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 918 · 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.Double 55 =
  3. 3.Half of 194 =
  4. 4.Double 91 =
  5. 5.Double 46 =
  6. 6.Half of 140 =
  7. 7.Half of 192 =
  8. 8.Half of 176 =
  9. 9.Double 73 =
  10. 10.Half of 96 =
  11. 11.Double 24 =
  12. 12.Double 77 =
  13. 13.Double 29 =
  14. 14.Double 37 =
  15. 15.Double 28 =
  16. 16.Double 34 =
  17. 17.Half of 160 =
  18. 18.Double 79 =
  19. 19.Double 48 =
  20. 20.Half of 170 =
  21. 21.Half of 188 =
  22. 22.Double 26 =
  23. 23.Double 89 =
  24. 24.Double 92 =
  25. 25.Half of 28 =
  26. 26.Double 65 =
  27. 27.Half of 182 =
  28. 28.Double 97 =
  29. 29.Double 51 =
  30. 30.Half of 104 =
  31. 31.Double 21 =
  32. 32.Half of 84 =
  33. 33.Half of 70 =
  34. 34.Half of 48 =
  35. 35.Half of 100 =
  36. 36.Double 84 =
  37. 37.Double 75 =
  38. 38.Double 41 =
  39. 39.Half of 146 =
  40. 40.Double 36 =

Answer key

  1. 126
  2. 110
  3. 97
  4. 182
  5. 92
  6. 70
  7. 96
  8. 88
  9. 146
  10. 48
  11. 48
  12. 154
  13. 58
  14. 74
  15. 56
  16. 68
  17. 80
  18. 158
  19. 96
  20. 85
  21. 94
  22. 52
  23. 178
  24. 184
  25. 14
  26. 130
  27. 91
  28. 194
  29. 102
  30. 52
  31. 42
  32. 42
  33. 35
  34. 24
  35. 50
  36. 168
  37. 150
  38. 82
  39. 73
  40. 72

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