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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 385 · 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. 1.39² =
  2. 2.76² =
  3. 3.92² =
  4. 4.91² =
  5. 5.94² =
  6. 6.45² =
  7. 7.37² =
  8. 8.81² =
  9. 9.82² =
  10. 10.72² =
  11. 11.99² =
  12. 12.77² =
  13. 13.51² =
  14. 14.61² =
  15. 15.31² =
  16. 16.73² =
  17. 17.35² =
  18. 18.41² =
  19. 19.56² =
  20. 20.74² =
  21. 21.86² =
  22. 22.55² =
  23. 23.49² =
  24. 24.54² =
  25. 25.71² =
  26. 26.84² =
  27. 27.48² =
  28. 28.32² =
  29. 29.57² =
  30. 30.67² =
  31. 31.68² =
  32. 32.96² =
  33. 33.34² =
  34. 34.66² =
  35. 35.85² =
  36. 36.83² =
  37. 37.46² =
  38. 38.97² =
  39. 39.33² =
  40. 40.64² =

Answer key

  1. 1521
  2. 5776
  3. 8464
  4. 8281
  5. 8836
  6. 2025
  7. 1369
  8. 6561
  9. 6724
  10. 5184
  11. 9801
  12. 5929
  13. 2601
  14. 3721
  15. 961
  16. 5329
  17. 1225
  18. 1681
  19. 3136
  20. 5476
  21. 7396
  22. 3025
  23. 2401
  24. 2916
  25. 5041
  26. 7056
  27. 2304
  28. 1024
  29. 3249
  30. 4489
  31. 4624
  32. 9216
  33. 1156
  34. 4356
  35. 7225
  36. 6889
  37. 2116
  38. 9409
  39. 1089
  40. 4096

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