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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 437 · 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. 1.64² =
  2. 2.34² =
  3. 3.58² =
  4. 4.42² =
  5. 5.84² =
  6. 6.98² =
  7. 7.95² =
  8. 8.31² =
  9. 9.47² =
  10. 10.37² =
  11. 11.99² =
  12. 12.38² =
  13. 13.56² =
  14. 14.48² =
  15. 15.39² =
  16. 16.61² =
  17. 17.51² =
  18. 18.36² =
  19. 19.96² =
  20. 20.89² =
  21. 21.66² =
  22. 22.46² =
  23. 23.41² =
  24. 24.91² =
  25. 25.54² =
  26. 26.71² =
  27. 27.93² =
  28. 28.53² =
  29. 29.72² =
  30. 30.44² =
  31. 31.97² =
  32. 32.85² =
  33. 33.45² =
  34. 34.75² =
  35. 35.76² =
  36. 36.65² =
  37. 37.74² =
  38. 38.82² =
  39. 39.43² =
  40. 40.81² =

Answer key

  1. 4096
  2. 1156
  3. 3364
  4. 1764
  5. 7056
  6. 9604
  7. 9025
  8. 961
  9. 2209
  10. 1369
  11. 9801
  12. 1444
  13. 3136
  14. 2304
  15. 1521
  16. 3721
  17. 2601
  18. 1296
  19. 9216
  20. 7921
  21. 4356
  22. 2116
  23. 1681
  24. 8281
  25. 2916
  26. 5041
  27. 8649
  28. 2809
  29. 5184
  30. 1936
  31. 9409
  32. 7225
  33. 2025
  34. 5625
  35. 5776
  36. 4225
  37. 5476
  38. 6724
  39. 1849
  40. 6561

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