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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 415 · 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. 1.51² =
  2. 2.37² =
  3. 3.67² =
  4. 4.47² =
  5. 5.93² =
  6. 6.33² =
  7. 7.69² =
  8. 8.31² =
  9. 9.61² =
  10. 10.99² =
  11. 11.36² =
  12. 12.57² =
  13. 13.92² =
  14. 14.46² =
  15. 15.79² =
  16. 16.64² =
  17. 17.75² =
  18. 18.63² =
  19. 19.74² =
  20. 20.91² =
  21. 21.39² =
  22. 22.85² =
  23. 23.88² =
  24. 24.53² =
  25. 25.54² =
  26. 26.82² =
  27. 27.81² =
  28. 28.72² =
  29. 29.83² =
  30. 30.77² =
  31. 31.87² =
  32. 32.71² =
  33. 33.96² =
  34. 34.32² =
  35. 35.58² =
  36. 36.48² =
  37. 37.45² =
  38. 38.49² =
  39. 39.95² =
  40. 40.59² =

Answer key

  1. 2601
  2. 1369
  3. 4489
  4. 2209
  5. 8649
  6. 1089
  7. 4761
  8. 961
  9. 3721
  10. 9801
  11. 1296
  12. 3249
  13. 8464
  14. 2116
  15. 6241
  16. 4096
  17. 5625
  18. 3969
  19. 5476
  20. 8281
  21. 1521
  22. 7225
  23. 7744
  24. 2809
  25. 2916
  26. 6724
  27. 6561
  28. 5184
  29. 6889
  30. 5929
  31. 7569
  32. 5041
  33. 9216
  34. 1024
  35. 3364
  36. 2304
  37. 2025
  38. 2401
  39. 9025
  40. 3481

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