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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 439 · 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. 1.64² =
  2. 2.83² =
  3. 3.89² =
  4. 4.58² =
  5. 5.35² =
  6. 6.36² =
  7. 7.81² =
  8. 8.75² =
  9. 9.77² =
  10. 10.59² =
  11. 11.31² =
  12. 12.39² =
  13. 13.37² =
  14. 14.87² =
  15. 15.61² =
  16. 16.85² =
  17. 17.71² =
  18. 18.91² =
  19. 19.51² =
  20. 20.44² =
  21. 21.79² =
  22. 22.41² =
  23. 23.86² =
  24. 24.97² =
  25. 25.95² =
  26. 26.76² =
  27. 27.46² =
  28. 28.47² =
  29. 29.82² =
  30. 30.53² =
  31. 31.93² =
  32. 32.55² =
  33. 33.98² =
  34. 34.32² =
  35. 35.43² =
  36. 36.48² =
  37. 37.94² =
  38. 38.56² =
  39. 39.33² =
  40. 40.49² =

Answer key

  1. 4096
  2. 6889
  3. 7921
  4. 3364
  5. 1225
  6. 1296
  7. 6561
  8. 5625
  9. 5929
  10. 3481
  11. 961
  12. 1521
  13. 1369
  14. 7569
  15. 3721
  16. 7225
  17. 5041
  18. 8281
  19. 2601
  20. 1936
  21. 6241
  22. 1681
  23. 7396
  24. 9409
  25. 9025
  26. 5776
  27. 2116
  28. 2209
  29. 6724
  30. 2809
  31. 8649
  32. 3025
  33. 9604
  34. 1024
  35. 1849
  36. 2304
  37. 8836
  38. 3136
  39. 1089
  40. 2401

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