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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 677 · 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. 1.98² =
  2. 2.41² =
  3. 3.81² =
  4. 4.66² =
  5. 5.86² =
  6. 6.87² =
  7. 7.39² =
  8. 8.96² =
  9. 9.34² =
  10. 10.71² =
  11. 11.97² =
  12. 12.91² =
  13. 13.75² =
  14. 14.55² =
  15. 15.48² =
  16. 16.74² =
  17. 17.65² =
  18. 18.95² =
  19. 19.46² =
  20. 20.78² =
  21. 21.68² =
  22. 22.82² =
  23. 23.42² =
  24. 24.69² =
  25. 25.59² =
  26. 26.76² =
  27. 27.99² =
  28. 28.43² =
  29. 29.73² =
  30. 30.93² =
  31. 31.84² =
  32. 32.45² =
  33. 33.56² =
  34. 34.32² =
  35. 35.35² =
  36. 36.94² =
  37. 37.67² =
  38. 38.72² =
  39. 39.49² =
  40. 40.51² =

Answer key

  1. 9604
  2. 1681
  3. 6561
  4. 4356
  5. 7396
  6. 7569
  7. 1521
  8. 9216
  9. 1156
  10. 5041
  11. 9409
  12. 8281
  13. 5625
  14. 3025
  15. 2304
  16. 5476
  17. 4225
  18. 9025
  19. 2116
  20. 6084
  21. 4624
  22. 6724
  23. 1764
  24. 4761
  25. 3481
  26. 5776
  27. 9801
  28. 1849
  29. 5329
  30. 8649
  31. 7056
  32. 2025
  33. 3136
  34. 1024
  35. 1225
  36. 8836
  37. 4489
  38. 5184
  39. 2401
  40. 2601

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