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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 701 · 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. 1.46² =
  2. 2.61² =
  3. 3.43² =
  4. 4.36² =
  5. 5.57² =
  6. 6.72² =
  7. 7.78² =
  8. 8.82² =
  9. 9.45² =
  10. 10.48² =
  11. 11.84² =
  12. 12.76² =
  13. 13.79² =
  14. 14.41² =
  15. 15.81² =
  16. 16.75² =
  17. 17.77² =
  18. 18.33² =
  19. 19.44² =
  20. 20.66² =
  21. 21.74² =
  22. 22.88² =
  23. 23.93² =
  24. 24.97² =
  25. 25.85² =
  26. 26.31² =
  27. 27.68² =
  28. 28.49² =
  29. 29.51² =
  30. 30.87² =
  31. 31.37² =
  32. 32.65² =
  33. 33.34² =
  34. 34.58² =
  35. 35.95² =
  36. 36.56² =
  37. 37.98² =
  38. 38.69² =
  39. 39.64² =
  40. 40.73² =

Answer key

  1. 2116
  2. 3721
  3. 1849
  4. 1296
  5. 3249
  6. 5184
  7. 6084
  8. 6724
  9. 2025
  10. 2304
  11. 7056
  12. 5776
  13. 6241
  14. 1681
  15. 6561
  16. 5625
  17. 5929
  18. 1089
  19. 1936
  20. 4356
  21. 5476
  22. 7744
  23. 8649
  24. 9409
  25. 7225
  26. 961
  27. 4624
  28. 2401
  29. 2601
  30. 7569
  31. 1369
  32. 4225
  33. 1156
  34. 3364
  35. 9025
  36. 3136
  37. 9604
  38. 4761
  39. 4096
  40. 5329

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