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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 436 · 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. 1.83² =
  2. 2.44² =
  3. 3.67² =
  4. 4.71² =
  5. 5.77² =
  6. 6.48² =
  7. 7.74² =
  8. 8.75² =
  9. 9.84² =
  10. 10.98² =
  11. 11.93² =
  12. 12.62² =
  13. 13.33² =
  14. 14.43² =
  15. 15.31² =
  16. 16.51² =
  17. 17.81² =
  18. 18.91² =
  19. 19.45² =
  20. 20.49² =
  21. 21.53² =
  22. 22.97² =
  23. 23.35² =
  24. 24.61² =
  25. 25.55² =
  26. 26.37² =
  27. 27.95² =
  28. 28.88² =
  29. 29.82² =
  30. 30.47² =
  31. 31.38² =
  32. 32.96² =
  33. 33.39² =
  34. 34.34² =
  35. 35.42² =
  36. 36.92² =
  37. 37.66² =
  38. 38.94² =
  39. 39.41² =
  40. 40.72² =

Answer key

  1. 6889
  2. 1936
  3. 4489
  4. 5041
  5. 5929
  6. 2304
  7. 5476
  8. 5625
  9. 7056
  10. 9604
  11. 8649
  12. 3844
  13. 1089
  14. 1849
  15. 961
  16. 2601
  17. 6561
  18. 8281
  19. 2025
  20. 2401
  21. 2809
  22. 9409
  23. 1225
  24. 3721
  25. 3025
  26. 1369
  27. 9025
  28. 7744
  29. 6724
  30. 2209
  31. 1444
  32. 9216
  33. 1521
  34. 1156
  35. 1764
  36. 8464
  37. 4356
  38. 8836
  39. 1681
  40. 5184

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