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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 978 · 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.Half of 188 =
  2. 2.Double 23 =
  3. 3.Half of 160 =
  4. 4.Double 24 =
  5. 5.Half of 40 =
  6. 6.Half of 50 =
  7. 7.Double 98 =
  8. 8.Half of 78 =
  9. 9.Double 79 =
  10. 10.Double 77 =
  11. 11.Half of 154 =
  12. 12.Double 73 =
  13. 13.Half of 48 =
  14. 14.Half of 114 =
  15. 15.Half of 104 =
  16. 16.Half of 100 =
  17. 17.Double 42 =
  18. 18.Half of 98 =
  19. 19.Double 39 =
  20. 20.Double 28 =
  21. 21.Half of 72 =
  22. 22.Double 62 =
  23. 23.Half of 178 =
  24. 24.Half of 122 =
  25. 25.Double 78 =
  26. 26.Double 21 =
  27. 27.Half of 44 =
  28. 28.Half of 190 =
  29. 29.Half of 142 =
  30. 30.Double 25 =
  31. 31.Double 86 =
  32. 32.Half of 36 =
  33. 33.Double 97 =
  34. 34.Half of 102 =
  35. 35.Half of 132 =
  36. 36.Double 55 =
  37. 37.Double 48 =
  38. 38.Half of 68 =
  39. 39.Half of 168 =
  40. 40.Half of 26 =

Answer key

  1. 94
  2. 46
  3. 80
  4. 48
  5. 20
  6. 25
  7. 196
  8. 39
  9. 158
  10. 154
  11. 77
  12. 146
  13. 24
  14. 57
  15. 52
  16. 50
  17. 84
  18. 49
  19. 78
  20. 56
  21. 36
  22. 124
  23. 89
  24. 61
  25. 156
  26. 42
  27. 22
  28. 95
  29. 71
  30. 50
  31. 172
  32. 18
  33. 194
  34. 51
  35. 66
  36. 110
  37. 96
  38. 34
  39. 84
  40. 13

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