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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 780 · 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. 1.67² =
  2. 2.65² =
  3. 3.63² =
  4. 4.38² =
  5. 5.72² =
  6. 6.68² =
  7. 7.41² =
  8. 8.49² =
  9. 9.81² =
  10. 10.85² =
  11. 11.69² =
  12. 12.32² =
  13. 13.58² =
  14. 14.57² =
  15. 15.75² =
  16. 16.83² =
  17. 17.82² =
  18. 18.37² =
  19. 19.35² =
  20. 20.46² =
  21. 21.95² =
  22. 22.45² =
  23. 23.88² =
  24. 24.87² =
  25. 25.62² =
  26. 26.56² =
  27. 27.99² =
  28. 28.79² =
  29. 29.66² =
  30. 30.43² =
  31. 31.36² =
  32. 32.91² =
  33. 33.61² =
  34. 34.74² =
  35. 35.71² =
  36. 36.73² =
  37. 37.89² =
  38. 38.39² =
  39. 39.34² =
  40. 40.52² =

Answer key

  1. 4489
  2. 4225
  3. 3969
  4. 1444
  5. 5184
  6. 4624
  7. 1681
  8. 2401
  9. 6561
  10. 7225
  11. 4761
  12. 1024
  13. 3364
  14. 3249
  15. 5625
  16. 6889
  17. 6724
  18. 1369
  19. 1225
  20. 2116
  21. 9025
  22. 2025
  23. 7744
  24. 7569
  25. 3844
  26. 3136
  27. 9801
  28. 6241
  29. 4356
  30. 1849
  31. 1296
  32. 8281
  33. 3721
  34. 5476
  35. 5041
  36. 5329
  37. 7921
  38. 1521
  39. 1156
  40. 2704

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