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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 115 · 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. 1.67² =
  2. 2.89² =
  3. 3.36² =
  4. 4.65² =
  5. 5.97² =
  6. 6.61² =
  7. 7.37² =
  8. 8.38² =
  9. 9.59² =
  10. 10.66² =
  11. 11.32² =
  12. 12.49² =
  13. 13.63² =
  14. 14.44² =
  15. 15.58² =
  16. 16.91² =
  17. 17.77² =
  18. 18.46² =
  19. 19.78² =
  20. 20.43² =
  21. 21.75² =
  22. 22.57² =
  23. 23.39² =
  24. 24.53² =
  25. 25.35² =
  26. 26.72² =
  27. 27.79² =
  28. 28.51² =
  29. 29.56² =
  30. 30.42² =
  31. 31.64² =
  32. 32.73² =
  33. 33.52² =
  34. 34.82² =
  35. 35.48² =
  36. 36.41² =
  37. 37.69² =
  38. 38.95² =
  39. 39.34² =
  40. 40.76² =

Answer key

  1. 4489
  2. 7921
  3. 1296
  4. 4225
  5. 9409
  6. 3721
  7. 1369
  8. 1444
  9. 3481
  10. 4356
  11. 1024
  12. 2401
  13. 3969
  14. 1936
  15. 3364
  16. 8281
  17. 5929
  18. 2116
  19. 6084
  20. 1849
  21. 5625
  22. 3249
  23. 1521
  24. 2809
  25. 1225
  26. 5184
  27. 6241
  28. 2601
  29. 3136
  30. 1764
  31. 4096
  32. 5329
  33. 2704
  34. 6724
  35. 2304
  36. 1681
  37. 4761
  38. 9025
  39. 1156
  40. 5776

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