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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 384 · 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. 1.49² =
  2. 2.93² =
  3. 3.47² =
  4. 4.65² =
  5. 5.66² =
  6. 6.58² =
  7. 7.91² =
  8. 8.67² =
  9. 9.77² =
  10. 10.48² =
  11. 11.39² =
  12. 12.45² =
  13. 13.69² =
  14. 14.42² =
  15. 15.61² =
  16. 16.59² =
  17. 17.88² =
  18. 18.31² =
  19. 19.52² =
  20. 20.55² =
  21. 21.46² =
  22. 22.85² =
  23. 23.53² =
  24. 24.32² =
  25. 25.87² =
  26. 26.51² =
  27. 27.97² =
  28. 28.98² =
  29. 29.38² =
  30. 30.34² =
  31. 31.43² =
  32. 32.84² =
  33. 33.82² =
  34. 34.81² =
  35. 35.41² =
  36. 36.75² =
  37. 37.44² =
  38. 38.78² =
  39. 39.35² =
  40. 40.64² =

Answer key

  1. 2401
  2. 8649
  3. 2209
  4. 4225
  5. 4356
  6. 3364
  7. 8281
  8. 4489
  9. 5929
  10. 2304
  11. 1521
  12. 2025
  13. 4761
  14. 1764
  15. 3721
  16. 3481
  17. 7744
  18. 961
  19. 2704
  20. 3025
  21. 2116
  22. 7225
  23. 2809
  24. 1024
  25. 7569
  26. 2601
  27. 9409
  28. 9604
  29. 1444
  30. 1156
  31. 1849
  32. 7056
  33. 6724
  34. 6561
  35. 1681
  36. 5625
  37. 1936
  38. 6084
  39. 1225
  40. 4096

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