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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 294 · 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. 2.42² =
  3. 3.51² =
  4. 4.36² =
  5. 5.52² =
  6. 6.55² =
  7. 7.99² =
  8. 8.78² =
  9. 9.85² =
  10. 10.62² =
  11. 11.98² =
  12. 12.97² =
  13. 13.69² =
  14. 14.64² =
  15. 15.71² =
  16. 16.81² =
  17. 17.68² =
  18. 18.91² =
  19. 19.39² =
  20. 20.84² =
  21. 21.74² =
  22. 22.57² =
  23. 23.93² =
  24. 24.53² =
  25. 25.63² =
  26. 26.45² =
  27. 27.54² =
  28. 28.76² =
  29. 29.61² =
  30. 30.48² =
  31. 31.79² =
  32. 32.49² =
  33. 33.44² =
  34. 34.46² =
  35. 35.82² =
  36. 36.59² =
  37. 37.35² =
  38. 38.31² =
  39. 39.37² =
  40. 40.89² =

Answer key

  1. 5625
  2. 1764
  3. 2601
  4. 1296
  5. 2704
  6. 3025
  7. 9801
  8. 6084
  9. 7225
  10. 3844
  11. 9604
  12. 9409
  13. 4761
  14. 4096
  15. 5041
  16. 6561
  17. 4624
  18. 8281
  19. 1521
  20. 7056
  21. 5476
  22. 3249
  23. 8649
  24. 2809
  25. 3969
  26. 2025
  27. 2916
  28. 5776
  29. 3721
  30. 2304
  31. 6241
  32. 2401
  33. 1936
  34. 2116
  35. 6724
  36. 3481
  37. 1225
  38. 961
  39. 1369
  40. 7921

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