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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 946 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.71² =
  2. 2.35² =
  3. 3.51² =
  4. 4.41² =
  5. 5.72² =
  6. 6.61² =
  7. 7.36² =
  8. 8.57² =
  9. 9.56² =
  10. 10.32² =
  11. 11.52² =
  12. 12.67² =
  13. 13.97² =
  14. 14.76² =
  15. 15.34² =
  16. 16.63² =
  17. 17.42² =
  18. 18.75² =
  19. 19.77² =
  20. 20.38² =
  21. 21.43² =
  22. 22.66² =
  23. 23.95² =
  24. 24.78² =
  25. 25.46² =
  26. 26.37² =
  27. 27.62² =
  28. 28.47² =
  29. 29.88² =
  30. 30.54² =
  31. 31.49² =
  32. 32.74² =
  33. 33.79² =
  34. 34.93² =
  35. 35.81² =
  36. 36.65² =
  37. 37.33² =
  38. 38.39² =
  39. 39.58² =
  40. 40.82² =

Answer key

  1. 5041
  2. 1225
  3. 2601
  4. 1681
  5. 5184
  6. 3721
  7. 1296
  8. 3249
  9. 3136
  10. 1024
  11. 2704
  12. 4489
  13. 9409
  14. 5776
  15. 1156
  16. 3969
  17. 1764
  18. 5625
  19. 5929
  20. 1444
  21. 1849
  22. 4356
  23. 9025
  24. 6084
  25. 2116
  26. 1369
  27. 3844
  28. 2209
  29. 7744
  30. 2916
  31. 2401
  32. 5476
  33. 6241
  34. 8649
  35. 6561
  36. 4225
  37. 1089
  38. 1521
  39. 3364
  40. 6724

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