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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 470 · 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. 1.61² =
  2. 2.56² =
  3. 3.51² =
  4. 4.91² =
  5. 5.92² =
  6. 6.84² =
  7. 7.43² =
  8. 8.69² =
  9. 9.41² =
  10. 10.32² =
  11. 11.49² =
  12. 12.55² =
  13. 13.71² =
  14. 14.39² =
  15. 15.37² =
  16. 16.33² =
  17. 17.81² =
  18. 18.53² =
  19. 19.64² =
  20. 20.42² =
  21. 21.93² =
  22. 22.52² =
  23. 23.99² =
  24. 24.38² =
  25. 25.72² =
  26. 26.74² =
  27. 27.65² =
  28. 28.86² =
  29. 29.68² =
  30. 30.63² =
  31. 31.95² =
  32. 32.75² =
  33. 33.72² =
  34. 34.48² =
  35. 35.78² =
  36. 36.36² =
  37. 37.96² =
  38. 38.46² =
  39. 39.98² =
  40. 40.94² =

Answer key

  1. 3721
  2. 3136
  3. 2601
  4. 8281
  5. 8464
  6. 7056
  7. 1849
  8. 4761
  9. 1681
  10. 1024
  11. 2401
  12. 3025
  13. 5041
  14. 1521
  15. 1369
  16. 1089
  17. 6561
  18. 2809
  19. 4096
  20. 1764
  21. 8649
  22. 2704
  23. 9801
  24. 1444
  25. 5184
  26. 5476
  27. 4225
  28. 7396
  29. 4624
  30. 3969
  31. 9025
  32. 5625
  33. 5184
  34. 2304
  35. 6084
  36. 1296
  37. 9216
  38. 2116
  39. 9604
  40. 8836

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