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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 578 · 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. 1.86² =
  2. 2.78² =
  3. 3.31² =
  4. 4.91² =
  5. 5.76² =
  6. 6.65² =
  7. 7.42² =
  8. 8.84² =
  9. 9.74² =
  10. 10.94² =
  11. 11.71² =
  12. 12.64² =
  13. 13.81² =
  14. 14.38² =
  15. 15.48² =
  16. 16.47² =
  17. 17.46² =
  18. 18.41² =
  19. 19.36² =
  20. 20.73² =
  21. 21.51² =
  22. 22.66² =
  23. 23.85² =
  24. 24.37² =
  25. 25.55² =
  26. 26.75² =
  27. 27.33² =
  28. 28.69² =
  29. 29.61² =
  30. 30.45² =
  31. 31.49² =
  32. 32.82² =
  33. 33.97² =
  34. 34.93² =
  35. 35.58² =
  36. 36.34² =
  37. 37.92² =
  38. 38.88² =
  39. 39.96² =
  40. 40.39² =

Answer key

  1. 7396
  2. 6084
  3. 961
  4. 8281
  5. 5776
  6. 4225
  7. 1764
  8. 7056
  9. 5476
  10. 8836
  11. 5041
  12. 4096
  13. 6561
  14. 1444
  15. 2304
  16. 2209
  17. 2116
  18. 1681
  19. 1296
  20. 5329
  21. 2601
  22. 4356
  23. 7225
  24. 1369
  25. 3025
  26. 5625
  27. 1089
  28. 4761
  29. 3721
  30. 2025
  31. 2401
  32. 6724
  33. 9409
  34. 8649
  35. 3364
  36. 1156
  37. 8464
  38. 7744
  39. 9216
  40. 1521

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