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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 469 · 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. 1.51² =
  2. 2.68² =
  3. 3.96² =
  4. 4.42² =
  5. 5.46² =
  6. 6.84² =
  7. 7.36² =
  8. 8.64² =
  9. 9.73² =
  10. 10.95² =
  11. 11.94² =
  12. 12.98² =
  13. 13.74² =
  14. 14.99² =
  15. 15.31² =
  16. 16.32² =
  17. 17.38² =
  18. 18.71² =
  19. 19.55² =
  20. 20.52² =
  21. 21.67² =
  22. 22.69² =
  23. 23.37² =
  24. 24.79² =
  25. 25.41² =
  26. 26.89² =
  27. 27.39² =
  28. 28.92² =
  29. 29.49² =
  30. 30.47² =
  31. 31.63² =
  32. 32.61² =
  33. 33.43² =
  34. 34.78² =
  35. 35.91² =
  36. 36.75² =
  37. 37.45² =
  38. 38.86² =
  39. 39.85² =
  40. 40.53² =

Answer key

  1. 2601
  2. 4624
  3. 9216
  4. 1764
  5. 2116
  6. 7056
  7. 1296
  8. 4096
  9. 5329
  10. 9025
  11. 8836
  12. 9604
  13. 5476
  14. 9801
  15. 961
  16. 1024
  17. 1444
  18. 5041
  19. 3025
  20. 2704
  21. 4489
  22. 4761
  23. 1369
  24. 6241
  25. 1681
  26. 7921
  27. 1521
  28. 8464
  29. 2401
  30. 2209
  31. 3969
  32. 3721
  33. 1849
  34. 6084
  35. 8281
  36. 5625
  37. 2025
  38. 7396
  39. 7225
  40. 2809

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