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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 280 · 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. 1.71² =
  2. 2.41² =
  3. 3.51² =
  4. 4.44² =
  5. 5.34² =
  6. 6.67² =
  7. 7.72² =
  8. 8.74² =
  9. 9.79² =
  10. 10.88² =
  11. 11.73² =
  12. 12.84² =
  13. 13.56² =
  14. 14.85² =
  15. 15.65² =
  16. 16.31² =
  17. 17.91² =
  18. 18.46² =
  19. 19.64² =
  20. 20.63² =
  21. 21.78² =
  22. 22.33² =
  23. 23.81² =
  24. 24.52² =
  25. 25.97² =
  26. 26.39² =
  27. 27.86² =
  28. 28.32² =
  29. 29.38² =
  30. 30.96² =
  31. 31.89² =
  32. 32.75² =
  33. 33.69² =
  34. 34.95² =
  35. 35.55² =
  36. 36.49² =
  37. 37.61² =
  38. 38.42² =
  39. 39.37² =
  40. 40.99² =

Answer key

  1. 5041
  2. 1681
  3. 2601
  4. 1936
  5. 1156
  6. 4489
  7. 5184
  8. 5476
  9. 6241
  10. 7744
  11. 5329
  12. 7056
  13. 3136
  14. 7225
  15. 4225
  16. 961
  17. 8281
  18. 2116
  19. 4096
  20. 3969
  21. 6084
  22. 1089
  23. 6561
  24. 2704
  25. 9409
  26. 1521
  27. 7396
  28. 1024
  29. 1444
  30. 9216
  31. 7921
  32. 5625
  33. 4761
  34. 9025
  35. 3025
  36. 2401
  37. 3721
  38. 1764
  39. 1369
  40. 9801

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