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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 108 · 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. 1.58² =
  2. 2.46² =
  3. 3.64² =
  4. 4.45² =
  5. 5.79² =
  6. 6.31² =
  7. 7.69² =
  8. 8.84² =
  9. 9.34² =
  10. 10.55² =
  11. 11.52² =
  12. 12.48² =
  13. 13.88² =
  14. 14.41² =
  15. 15.63² =
  16. 16.66² =
  17. 17.83² =
  18. 18.38² =
  19. 19.81² =
  20. 20.33² =
  21. 21.77² =
  22. 22.43² =
  23. 23.56² =
  24. 24.47² =
  25. 25.92² =
  26. 26.39² =
  27. 27.91² =
  28. 28.97² =
  29. 29.49² =
  30. 30.98² =
  31. 31.67² =
  32. 32.51² =
  33. 33.89² =
  34. 34.42² =
  35. 35.82² =
  36. 36.44² =
  37. 37.65² =
  38. 38.53² =
  39. 39.76² =
  40. 40.59² =

Answer key

  1. 3364
  2. 2116
  3. 4096
  4. 2025
  5. 6241
  6. 961
  7. 4761
  8. 7056
  9. 1156
  10. 3025
  11. 2704
  12. 2304
  13. 7744
  14. 1681
  15. 3969
  16. 4356
  17. 6889
  18. 1444
  19. 6561
  20. 1089
  21. 5929
  22. 1849
  23. 3136
  24. 2209
  25. 8464
  26. 1521
  27. 8281
  28. 9409
  29. 2401
  30. 9604
  31. 4489
  32. 2601
  33. 7921
  34. 1764
  35. 6724
  36. 1936
  37. 4225
  38. 2809
  39. 5776
  40. 3481

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