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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 253 · 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. 1.51² =
  2. 2.61² =
  3. 3.75² =
  4. 4.34² =
  5. 5.38² =
  6. 6.93² =
  7. 7.79² =
  8. 8.92² =
  9. 9.68² =
  10. 10.67² =
  11. 11.91² =
  12. 12.36² =
  13. 13.49² =
  14. 14.32² =
  15. 15.95² =
  16. 16.78² =
  17. 17.42² =
  18. 18.81² =
  19. 19.69² =
  20. 20.41² =
  21. 21.48² =
  22. 22.46² =
  23. 23.53² =
  24. 24.99² =
  25. 25.43² =
  26. 26.63² =
  27. 27.55² =
  28. 28.77² =
  29. 29.62² =
  30. 30.37² =
  31. 31.47² =
  32. 32.44² =
  33. 33.66² =
  34. 34.59² =
  35. 35.73² =
  36. 36.71² =
  37. 37.84² =
  38. 38.76² =
  39. 39.39² =
  40. 40.33² =

Answer key

  1. 2601
  2. 3721
  3. 5625
  4. 1156
  5. 1444
  6. 8649
  7. 6241
  8. 8464
  9. 4624
  10. 4489
  11. 8281
  12. 1296
  13. 2401
  14. 1024
  15. 9025
  16. 6084
  17. 1764
  18. 6561
  19. 4761
  20. 1681
  21. 2304
  22. 2116
  23. 2809
  24. 9801
  25. 1849
  26. 3969
  27. 3025
  28. 5929
  29. 3844
  30. 1369
  31. 2209
  32. 1936
  33. 4356
  34. 3481
  35. 5329
  36. 5041
  37. 7056
  38. 5776
  39. 1521
  40. 1089

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