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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 664 · 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. 1.89² =
  2. 2.32² =
  3. 3.51² =
  4. 4.82² =
  5. 5.39² =
  6. 6.44² =
  7. 7.74² =
  8. 8.55² =
  9. 9.68² =
  10. 10.41² =
  11. 11.86² =
  12. 12.83² =
  13. 13.61² =
  14. 14.33² =
  15. 15.43² =
  16. 16.58² =
  17. 17.95² =
  18. 18.71² =
  19. 19.47² =
  20. 20.72² =
  21. 21.56² =
  22. 22.34² =
  23. 23.99² =
  24. 24.38² =
  25. 25.52² =
  26. 26.65² =
  27. 27.35² =
  28. 28.64² =
  29. 29.31² =
  30. 30.76² =
  31. 31.79² =
  32. 32.88² =
  33. 33.85² =
  34. 34.75² =
  35. 35.42² =
  36. 36.91² =
  37. 37.48² =
  38. 38.87² =
  39. 39.98² =
  40. 40.96² =

Answer key

  1. 7921
  2. 1024
  3. 2601
  4. 6724
  5. 1521
  6. 1936
  7. 5476
  8. 3025
  9. 4624
  10. 1681
  11. 7396
  12. 6889
  13. 3721
  14. 1089
  15. 1849
  16. 3364
  17. 9025
  18. 5041
  19. 2209
  20. 5184
  21. 3136
  22. 1156
  23. 9801
  24. 1444
  25. 2704
  26. 4225
  27. 1225
  28. 4096
  29. 961
  30. 5776
  31. 6241
  32. 7744
  33. 7225
  34. 5625
  35. 1764
  36. 8281
  37. 2304
  38. 7569
  39. 9604
  40. 9216

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