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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 227 · 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. 1.52² =
  2. 2.74² =
  3. 3.54² =
  4. 4.33² =
  5. 5.61² =
  6. 6.83² =
  7. 7.59² =
  8. 8.87² =
  9. 9.43² =
  10. 10.81² =
  11. 11.47² =
  12. 12.69² =
  13. 13.73² =
  14. 14.85² =
  15. 15.89² =
  16. 16.48² =
  17. 17.38² =
  18. 18.35² =
  19. 19.63² =
  20. 20.71² =
  21. 21.68² =
  22. 22.45² =
  23. 23.37² =
  24. 24.88² =
  25. 25.51² =
  26. 26.39² =
  27. 27.94² =
  28. 28.34² =
  29. 29.79² =
  30. 30.41² =
  31. 31.95² =
  32. 32.32² =
  33. 33.67² =
  34. 34.65² =
  35. 35.93² =
  36. 36.58² =
  37. 37.31² =
  38. 38.84² =
  39. 39.82² =
  40. 40.57² =

Answer key

  1. 2704
  2. 5476
  3. 2916
  4. 1089
  5. 3721
  6. 6889
  7. 3481
  8. 7569
  9. 1849
  10. 6561
  11. 2209
  12. 4761
  13. 5329
  14. 7225
  15. 7921
  16. 2304
  17. 1444
  18. 1225
  19. 3969
  20. 5041
  21. 4624
  22. 2025
  23. 1369
  24. 7744
  25. 2601
  26. 1521
  27. 8836
  28. 1156
  29. 6241
  30. 1681
  31. 9025
  32. 1024
  33. 4489
  34. 4225
  35. 8649
  36. 3364
  37. 961
  38. 7056
  39. 6724
  40. 3249

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