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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 549 · 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. 1.41² =
  2. 2.45² =
  3. 3.96² =
  4. 4.88² =
  5. 5.59² =
  6. 6.62² =
  7. 7.64² =
  8. 8.95² =
  9. 9.35² =
  10. 10.92² =
  11. 11.79² =
  12. 12.33² =
  13. 13.98² =
  14. 14.78² =
  15. 15.71² =
  16. 16.39² =
  17. 17.31² =
  18. 18.67² =
  19. 19.38² =
  20. 20.37² =
  21. 21.48² =
  22. 22.89² =
  23. 23.87² =
  24. 24.68² =
  25. 25.82² =
  26. 26.51² =
  27. 27.36² =
  28. 28.93² =
  29. 29.86² =
  30. 30.55² =
  31. 31.81² =
  32. 32.91² =
  33. 33.65² =
  34. 34.72² =
  35. 35.42² =
  36. 36.32² =
  37. 37.56² =
  38. 38.46² =
  39. 39.57² =
  40. 40.83² =

Answer key

  1. 1681
  2. 2025
  3. 9216
  4. 7744
  5. 3481
  6. 3844
  7. 4096
  8. 9025
  9. 1225
  10. 8464
  11. 6241
  12. 1089
  13. 9604
  14. 6084
  15. 5041
  16. 1521
  17. 961
  18. 4489
  19. 1444
  20. 1369
  21. 2304
  22. 7921
  23. 7569
  24. 4624
  25. 6724
  26. 2601
  27. 1296
  28. 8649
  29. 7396
  30. 3025
  31. 6561
  32. 8281
  33. 4225
  34. 5184
  35. 1764
  36. 1024
  37. 3136
  38. 2116
  39. 3249
  40. 6889

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