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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 407 · 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. 1.42² =
  2. 2.84² =
  3. 3.32² =
  4. 4.85² =
  5. 5.39² =
  6. 6.58² =
  7. 7.41² =
  8. 8.77² =
  9. 9.57² =
  10. 10.65² =
  11. 11.96² =
  12. 12.63² =
  13. 13.87² =
  14. 14.56² =
  15. 15.71² =
  16. 16.47² =
  17. 17.66² =
  18. 18.88² =
  19. 19.98² =
  20. 20.33² =
  21. 21.99² =
  22. 22.34² =
  23. 23.48² =
  24. 24.94² =
  25. 25.45² =
  26. 26.69² =
  27. 27.97² =
  28. 28.78² =
  29. 29.91² =
  30. 30.49² =
  31. 31.81² =
  32. 32.93² =
  33. 33.79² =
  34. 34.43² =
  35. 35.51² =
  36. 36.59² =
  37. 37.55² =
  38. 38.52² =
  39. 39.46² =
  40. 40.54² =

Answer key

  1. 1764
  2. 7056
  3. 1024
  4. 7225
  5. 1521
  6. 3364
  7. 1681
  8. 5929
  9. 3249
  10. 4225
  11. 9216
  12. 3969
  13. 7569
  14. 3136
  15. 5041
  16. 2209
  17. 4356
  18. 7744
  19. 9604
  20. 1089
  21. 9801
  22. 1156
  23. 2304
  24. 8836
  25. 2025
  26. 4761
  27. 9409
  28. 6084
  29. 8281
  30. 2401
  31. 6561
  32. 8649
  33. 6241
  34. 1849
  35. 2601
  36. 3481
  37. 3025
  38. 2704
  39. 2116
  40. 2916

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