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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 829 · 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. 1.95² =
  2. 2.71² =
  3. 3.56² =
  4. 4.81² =
  5. 5.41² =
  6. 6.38² =
  7. 7.89² =
  8. 8.47² =
  9. 9.55² =
  10. 10.74² =
  11. 11.61² =
  12. 12.84² =
  13. 13.35² =
  14. 14.46² =
  15. 15.52² =
  16. 16.65² =
  17. 17.93² =
  18. 18.66² =
  19. 19.42² =
  20. 20.45² =
  21. 21.94² =
  22. 22.97² =
  23. 23.57² =
  24. 24.53² =
  25. 25.36² =
  26. 26.78² =
  27. 27.85² =
  28. 28.48² =
  29. 29.68² =
  30. 30.82² =
  31. 31.34² =
  32. 32.59² =
  33. 33.39² =
  34. 34.83² =
  35. 35.54² =
  36. 36.75² =
  37. 37.73² =
  38. 38.37² =
  39. 39.98² =
  40. 40.77² =

Answer key

  1. 9025
  2. 5041
  3. 3136
  4. 6561
  5. 1681
  6. 1444
  7. 7921
  8. 2209
  9. 3025
  10. 5476
  11. 3721
  12. 7056
  13. 1225
  14. 2116
  15. 2704
  16. 4225
  17. 8649
  18. 4356
  19. 1764
  20. 2025
  21. 8836
  22. 9409
  23. 3249
  24. 2809
  25. 1296
  26. 6084
  27. 7225
  28. 2304
  29. 4624
  30. 6724
  31. 1156
  32. 3481
  33. 1521
  34. 6889
  35. 2916
  36. 5625
  37. 5329
  38. 1369
  39. 9604
  40. 5929

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