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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 710 · 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. 1.32² =
  2. 2.95² =
  3. 3.85² =
  4. 4.59² =
  5. 5.49² =
  6. 6.76² =
  7. 7.63² =
  8. 8.96² =
  9. 9.89² =
  10. 10.45² =
  11. 11.39² =
  12. 12.93² =
  13. 13.52² =
  14. 14.71² =
  15. 15.79² =
  16. 16.88² =
  17. 17.69² =
  18. 18.99² =
  19. 19.37² =
  20. 20.98² =
  21. 21.86² =
  22. 22.38² =
  23. 23.94² =
  24. 24.78² =
  25. 25.41² =
  26. 26.68² =
  27. 27.51² =
  28. 28.55² =
  29. 29.74² =
  30. 30.35² =
  31. 31.31² =
  32. 32.53² =
  33. 33.36² =
  34. 34.42² =
  35. 35.43² =
  36. 36.57² =
  37. 37.81² =
  38. 38.46² =
  39. 39.54² =
  40. 40.47² =

Answer key

  1. 1024
  2. 9025
  3. 7225
  4. 3481
  5. 2401
  6. 5776
  7. 3969
  8. 9216
  9. 7921
  10. 2025
  11. 1521
  12. 8649
  13. 2704
  14. 5041
  15. 6241
  16. 7744
  17. 4761
  18. 9801
  19. 1369
  20. 9604
  21. 7396
  22. 1444
  23. 8836
  24. 6084
  25. 1681
  26. 4624
  27. 2601
  28. 3025
  29. 5476
  30. 1225
  31. 961
  32. 2809
  33. 1296
  34. 1764
  35. 1849
  36. 3249
  37. 6561
  38. 2116
  39. 2916
  40. 2209

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