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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 22 · 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. 1.53² =
  2. 2.49² =
  3. 3.62² =
  4. 4.67² =
  5. 5.52² =
  6. 6.55² =
  7. 7.91² =
  8. 8.74² =
  9. 9.39² =
  10. 10.41² =
  11. 11.59² =
  12. 12.81² =
  13. 13.69² =
  14. 14.61² =
  15. 15.64² =
  16. 16.99² =
  17. 17.46² =
  18. 18.94² =
  19. 19.43² =
  20. 20.45² =
  21. 21.84² =
  22. 22.86² =
  23. 23.85² =
  24. 24.31² =
  25. 25.63² =
  26. 26.37² =
  27. 27.97² =
  28. 28.79² =
  29. 29.98² =
  30. 30.95² =
  31. 31.47² =
  32. 32.51² =
  33. 33.34² =
  34. 34.36² =
  35. 35.93² =
  36. 36.35² =
  37. 37.87² =
  38. 38.62² =
  39. 39.75² =
  40. 40.78² =

Answer key

  1. 2809
  2. 2401
  3. 3844
  4. 4489
  5. 2704
  6. 3025
  7. 8281
  8. 5476
  9. 1521
  10. 1681
  11. 3481
  12. 6561
  13. 4761
  14. 3721
  15. 4096
  16. 9801
  17. 2116
  18. 8836
  19. 1849
  20. 2025
  21. 7056
  22. 7396
  23. 7225
  24. 961
  25. 3969
  26. 1369
  27. 9409
  28. 6241
  29. 9604
  30. 9025
  31. 2209
  32. 2601
  33. 1156
  34. 1296
  35. 8649
  36. 1225
  37. 7569
  38. 3844
  39. 5625
  40. 6084

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