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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 3 · 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. 1.68² =
  2. 2.59² =
  3. 3.95² =
  4. 4.98² =
  5. 5.93² =
  6. 6.47² =
  7. 7.49² =
  8. 8.85² =
  9. 9.91² =
  10. 10.36² =
  11. 11.31² =
  12. 12.84² =
  13. 13.88² =
  14. 14.44² =
  15. 15.78² =
  16. 16.35² =
  17. 17.87² =
  18. 18.52² =
  19. 19.51² =
  20. 20.33² =
  21. 21.83² =
  22. 22.97² =
  23. 23.45² =
  24. 24.72² =
  25. 25.99² =
  26. 26.61² =
  27. 27.58² =
  28. 28.62² =
  29. 29.37² =
  30. 30.81² =
  31. 31.41² =
  32. 32.92² =
  33. 33.48² =
  34. 34.67² =
  35. 35.57² =
  36. 36.69² =
  37. 37.54² =
  38. 38.42² =
  39. 39.86² =
  40. 40.71² =

Answer key

  1. 4624
  2. 3481
  3. 9025
  4. 9604
  5. 8649
  6. 2209
  7. 2401
  8. 7225
  9. 8281
  10. 1296
  11. 961
  12. 7056
  13. 7744
  14. 1936
  15. 6084
  16. 1225
  17. 7569
  18. 2704
  19. 2601
  20. 1089
  21. 6889
  22. 9409
  23. 2025
  24. 5184
  25. 9801
  26. 3721
  27. 3364
  28. 3844
  29. 1369
  30. 6561
  31. 1681
  32. 8464
  33. 2304
  34. 4489
  35. 3249
  36. 4761
  37. 2916
  38. 1764
  39. 7396
  40. 5041

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