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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 547 · 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. 2.99² =
  3. 3.32² =
  4. 4.62² =
  5. 5.34² =
  6. 6.43² =
  7. 7.58² =
  8. 8.81² =
  9. 9.93² =
  10. 10.55² =
  11. 11.49² =
  12. 12.82² =
  13. 13.51² =
  14. 14.98² =
  15. 15.31² =
  16. 16.75² =
  17. 17.68² =
  18. 18.65² =
  19. 19.91² =
  20. 20.96² =
  21. 21.76² =
  22. 22.63² =
  23. 23.95² =
  24. 24.85² =
  25. 25.61² =
  26. 26.37² =
  27. 27.79² =
  28. 28.33² =
  29. 29.84² =
  30. 30.71² =
  31. 31.88² =
  32. 32.86² =
  33. 33.39² =
  34. 34.44² =
  35. 35.66² =
  36. 36.35² =
  37. 37.94² =
  38. 38.97² =
  39. 39.52² =
  40. 40.46² =

Answer key

  1. 1681
  2. 9801
  3. 1024
  4. 3844
  5. 1156
  6. 1849
  7. 3364
  8. 6561
  9. 8649
  10. 3025
  11. 2401
  12. 6724
  13. 2601
  14. 9604
  15. 961
  16. 5625
  17. 4624
  18. 4225
  19. 8281
  20. 9216
  21. 5776
  22. 3969
  23. 9025
  24. 7225
  25. 3721
  26. 1369
  27. 6241
  28. 1089
  29. 7056
  30. 5041
  31. 7744
  32. 7396
  33. 1521
  34. 1936
  35. 4356
  36. 1225
  37. 8836
  38. 9409
  39. 2704
  40. 2116

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