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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 696 · 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. 1.35² =
  2. 2.65² =
  3. 3.49² =
  4. 4.33² =
  5. 5.34² =
  6. 6.45² =
  7. 7.87² =
  8. 8.71² =
  9. 9.74² =
  10. 10.37² =
  11. 11.32² =
  12. 12.57² =
  13. 13.88² =
  14. 14.91² =
  15. 15.95² =
  16. 16.89² =
  17. 17.38² =
  18. 18.83² =
  19. 19.77² =
  20. 20.72² =
  21. 21.99² =
  22. 22.51² =
  23. 23.36² =
  24. 24.44² =
  25. 25.58² =
  26. 26.75² =
  27. 27.55² =
  28. 28.43² =
  29. 29.82² =
  30. 30.53² =
  31. 31.41² =
  32. 32.68² =
  33. 33.76² =
  34. 34.73² =
  35. 35.61² =
  36. 36.54² =
  37. 37.69² =
  38. 38.48² =
  39. 39.46² =
  40. 40.79² =

Answer key

  1. 1225
  2. 4225
  3. 2401
  4. 1089
  5. 1156
  6. 2025
  7. 7569
  8. 5041
  9. 5476
  10. 1369
  11. 1024
  12. 3249
  13. 7744
  14. 8281
  15. 9025
  16. 7921
  17. 1444
  18. 6889
  19. 5929
  20. 5184
  21. 9801
  22. 2601
  23. 1296
  24. 1936
  25. 3364
  26. 5625
  27. 3025
  28. 1849
  29. 6724
  30. 2809
  31. 1681
  32. 4624
  33. 5776
  34. 5329
  35. 3721
  36. 2916
  37. 4761
  38. 2304
  39. 2116
  40. 6241

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