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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 62 · 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. 1.42² =
  2. 2.93² =
  3. 3.32² =
  4. 4.31² =
  5. 5.92² =
  6. 6.68² =
  7. 7.79² =
  8. 8.95² =
  9. 9.82² =
  10. 10.87² =
  11. 11.53² =
  12. 12.41² =
  13. 13.51² =
  14. 14.83² =
  15. 15.85² =
  16. 16.74² =
  17. 17.61² =
  18. 18.45² =
  19. 19.66² =
  20. 20.75² =
  21. 21.72² =
  22. 22.64² =
  23. 23.62² =
  24. 24.99² =
  25. 25.78² =
  26. 26.55² =
  27. 27.69² =
  28. 28.35² =
  29. 29.44² =
  30. 30.65² =
  31. 31.67² =
  32. 32.48² =
  33. 33.56² =
  34. 34.89² =
  35. 35.71² =
  36. 36.86² =
  37. 37.58² =
  38. 38.81² =
  39. 39.39² =
  40. 40.59² =

Answer key

  1. 1764
  2. 8649
  3. 1024
  4. 961
  5. 8464
  6. 4624
  7. 6241
  8. 9025
  9. 6724
  10. 7569
  11. 2809
  12. 1681
  13. 2601
  14. 6889
  15. 7225
  16. 5476
  17. 3721
  18. 2025
  19. 4356
  20. 5625
  21. 5184
  22. 4096
  23. 3844
  24. 9801
  25. 6084
  26. 3025
  27. 4761
  28. 1225
  29. 1936
  30. 4225
  31. 4489
  32. 2304
  33. 3136
  34. 7921
  35. 5041
  36. 7396
  37. 3364
  38. 6561
  39. 1521
  40. 3481

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