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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 642 · 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. 1.73² =
  2. 2.79² =
  3. 3.38² =
  4. 4.76² =
  5. 5.94² =
  6. 6.32² =
  7. 7.91² =
  8. 8.33² =
  9. 9.47² =
  10. 10.62² =
  11. 11.36² =
  12. 12.39² =
  13. 13.37² =
  14. 14.41² =
  15. 15.59² =
  16. 16.34² =
  17. 17.68² =
  18. 18.46² =
  19. 19.97² =
  20. 20.48² =
  21. 21.75² =
  22. 22.96² =
  23. 23.82² =
  24. 24.56² =
  25. 25.49² =
  26. 26.93² =
  27. 27.69² =
  28. 28.74² =
  29. 29.71² =
  30. 30.89² =
  31. 31.83² =
  32. 32.58² =
  33. 33.44² =
  34. 34.99² =
  35. 35.42² =
  36. 36.78² =
  37. 37.57² =
  38. 38.66² =
  39. 39.61² =
  40. 40.98² =

Answer key

  1. 5329
  2. 6241
  3. 1444
  4. 5776
  5. 8836
  6. 1024
  7. 8281
  8. 1089
  9. 2209
  10. 3844
  11. 1296
  12. 1521
  13. 1369
  14. 1681
  15. 3481
  16. 1156
  17. 4624
  18. 2116
  19. 9409
  20. 2304
  21. 5625
  22. 9216
  23. 6724
  24. 3136
  25. 2401
  26. 8649
  27. 4761
  28. 5476
  29. 5041
  30. 7921
  31. 6889
  32. 3364
  33. 1936
  34. 9801
  35. 1764
  36. 6084
  37. 3249
  38. 4356
  39. 3721
  40. 9604

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