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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 380 · 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. 1.45² =
  2. 2.74² =
  3. 3.56² =
  4. 4.69² =
  5. 5.38² =
  6. 6.55² =
  7. 7.79² =
  8. 8.51² =
  9. 9.81² =
  10. 10.75² =
  11. 11.37² =
  12. 12.96² =
  13. 13.76² =
  14. 14.98² =
  15. 15.67² =
  16. 16.68² =
  17. 17.36² =
  18. 18.82² =
  19. 19.59² =
  20. 20.63² =
  21. 21.58² =
  22. 22.52² =
  23. 23.49² =
  24. 24.84² =
  25. 25.89² =
  26. 26.87² =
  27. 27.34² =
  28. 28.73² =
  29. 29.54² =
  30. 30.61² =
  31. 31.48² =
  32. 32.46² =
  33. 33.99² =
  34. 34.86² =
  35. 35.65² =
  36. 36.39² =
  37. 37.35² =
  38. 38.93² =
  39. 39.62² =
  40. 40.32² =

Answer key

  1. 2025
  2. 5476
  3. 3136
  4. 4761
  5. 1444
  6. 3025
  7. 6241
  8. 2601
  9. 6561
  10. 5625
  11. 1369
  12. 9216
  13. 5776
  14. 9604
  15. 4489
  16. 4624
  17. 1296
  18. 6724
  19. 3481
  20. 3969
  21. 3364
  22. 2704
  23. 2401
  24. 7056
  25. 7921
  26. 7569
  27. 1156
  28. 5329
  29. 2916
  30. 3721
  31. 2304
  32. 2116
  33. 9801
  34. 7396
  35. 4225
  36. 1521
  37. 1225
  38. 8649
  39. 3844
  40. 1024

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