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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 596 · 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. 1.62² =
  2. 2.46² =
  3. 3.59² =
  4. 4.98² =
  5. 5.45² =
  6. 6.47² =
  7. 7.61² =
  8. 8.75² =
  9. 9.68² =
  10. 10.48² =
  11. 11.76² =
  12. 12.81² =
  13. 13.66² =
  14. 14.32² =
  15. 15.57² =
  16. 16.44² =
  17. 17.52² =
  18. 18.54² =
  19. 19.95² =
  20. 20.41² =
  21. 21.63² =
  22. 22.56² =
  23. 23.53² =
  24. 24.34² =
  25. 25.93² =
  26. 26.97² =
  27. 27.92² =
  28. 28.78² =
  29. 29.55² =
  30. 30.67² =
  31. 31.39² =
  32. 32.58² =
  33. 33.85² =
  34. 34.43² =
  35. 35.74² =
  36. 36.96² =
  37. 37.71² =
  38. 38.99² =
  39. 39.37² =
  40. 40.69² =

Answer key

  1. 3844
  2. 2116
  3. 3481
  4. 9604
  5. 2025
  6. 2209
  7. 3721
  8. 5625
  9. 4624
  10. 2304
  11. 5776
  12. 6561
  13. 4356
  14. 1024
  15. 3249
  16. 1936
  17. 2704
  18. 2916
  19. 9025
  20. 1681
  21. 3969
  22. 3136
  23. 2809
  24. 1156
  25. 8649
  26. 9409
  27. 8464
  28. 6084
  29. 3025
  30. 4489
  31. 1521
  32. 3364
  33. 7225
  34. 1849
  35. 5476
  36. 9216
  37. 5041
  38. 9801
  39. 1369
  40. 4761

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