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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 323 · 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. 1.55² =
  2. 2.51² =
  3. 3.61² =
  4. 4.34² =
  5. 5.91² =
  6. 6.79² =
  7. 7.48² =
  8. 8.59² =
  9. 9.64² =
  10. 10.43² =
  11. 11.98² =
  12. 12.87² =
  13. 13.71² =
  14. 14.97² =
  15. 15.44² =
  16. 16.92² =
  17. 17.76² =
  18. 18.69² =
  19. 19.42² =
  20. 20.39² =
  21. 21.52² =
  22. 22.36² =
  23. 23.81² =
  24. 24.46² =
  25. 25.85² =
  26. 26.84² =
  27. 27.89² =
  28. 28.56² =
  29. 29.49² =
  30. 30.95² =
  31. 31.47² =
  32. 32.75² =
  33. 33.38² =
  34. 34.73² =
  35. 35.99² =
  36. 36.94² =
  37. 37.57² =
  38. 38.33² =
  39. 39.41² =
  40. 40.32² =

Answer key

  1. 3025
  2. 2601
  3. 3721
  4. 1156
  5. 8281
  6. 6241
  7. 2304
  8. 3481
  9. 4096
  10. 1849
  11. 9604
  12. 7569
  13. 5041
  14. 9409
  15. 1936
  16. 8464
  17. 5776
  18. 4761
  19. 1764
  20. 1521
  21. 2704
  22. 1296
  23. 6561
  24. 2116
  25. 7225
  26. 7056
  27. 7921
  28. 3136
  29. 2401
  30. 9025
  31. 2209
  32. 5625
  33. 1444
  34. 5329
  35. 9801
  36. 8836
  37. 3249
  38. 1089
  39. 1681
  40. 1024

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