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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 246 · 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. 1.87² =
  2. 2.35² =
  3. 3.33² =
  4. 4.99² =
  5. 5.53² =
  6. 6.43² =
  7. 7.81² =
  8. 8.83² =
  9. 9.89² =
  10. 10.71² =
  11. 11.47² =
  12. 12.84² =
  13. 13.92² =
  14. 14.32² =
  15. 15.61² =
  16. 16.69² =
  17. 17.41² =
  18. 18.91² =
  19. 19.79² =
  20. 20.94² =
  21. 21.48² =
  22. 22.67² =
  23. 23.64² =
  24. 24.95² =
  25. 25.58² =
  26. 26.65² =
  27. 27.46² =
  28. 28.51² =
  29. 29.37² =
  30. 30.93² =
  31. 31.85² =
  32. 32.44² =
  33. 33.45² =
  34. 34.39² =
  35. 35.82² =
  36. 36.62² =
  37. 37.42² =
  38. 38.34² =
  39. 39.55² =
  40. 40.88² =

Answer key

  1. 7569
  2. 1225
  3. 1089
  4. 9801
  5. 2809
  6. 1849
  7. 6561
  8. 6889
  9. 7921
  10. 5041
  11. 2209
  12. 7056
  13. 8464
  14. 1024
  15. 3721
  16. 4761
  17. 1681
  18. 8281
  19. 6241
  20. 8836
  21. 2304
  22. 4489
  23. 4096
  24. 9025
  25. 3364
  26. 4225
  27. 2116
  28. 2601
  29. 1369
  30. 8649
  31. 7225
  32. 1936
  33. 2025
  34. 1521
  35. 6724
  36. 3844
  37. 1764
  38. 1156
  39. 3025
  40. 7744

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