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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 126 · 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. 1.75² =
  2. 2.89² =
  3. 3.99² =
  4. 4.79² =
  5. 5.56² =
  6. 6.34² =
  7. 7.65² =
  8. 8.37² =
  9. 9.69² =
  10. 10.45² =
  11. 11.73² =
  12. 12.38² =
  13. 13.98² =
  14. 14.95² =
  15. 15.78² =
  16. 16.88² =
  17. 17.33² =
  18. 18.85² =
  19. 19.71² =
  20. 20.54² =
  21. 21.83² =
  22. 22.41² =
  23. 23.32² =
  24. 24.66² =
  25. 25.46² =
  26. 26.52² =
  27. 27.76² =
  28. 28.59² =
  29. 29.47² =
  30. 30.82² =
  31. 31.49² =
  32. 32.55² =
  33. 33.51² =
  34. 34.74² =
  35. 35.36² =
  36. 36.35² =
  37. 37.86² =
  38. 38.64² =
  39. 39.87² =
  40. 40.94² =

Answer key

  1. 5625
  2. 7921
  3. 9801
  4. 6241
  5. 3136
  6. 1156
  7. 4225
  8. 1369
  9. 4761
  10. 2025
  11. 5329
  12. 1444
  13. 9604
  14. 9025
  15. 6084
  16. 7744
  17. 1089
  18. 7225
  19. 5041
  20. 2916
  21. 6889
  22. 1681
  23. 1024
  24. 4356
  25. 2116
  26. 2704
  27. 5776
  28. 3481
  29. 2209
  30. 6724
  31. 2401
  32. 3025
  33. 2601
  34. 5476
  35. 1296
  36. 1225
  37. 7396
  38. 4096
  39. 7569
  40. 8836

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