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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 816 · 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. 2.38² =
  3. 3.67² =
  4. 4.34² =
  5. 5.35² =
  6. 6.81² =
  7. 7.68² =
  8. 8.36² =
  9. 9.46² =
  10. 10.86² =
  11. 11.84² =
  12. 12.49² =
  13. 13.89² =
  14. 14.53² =
  15. 15.48² =
  16. 16.85² =
  17. 17.71² =
  18. 18.91² =
  19. 19.63² =
  20. 20.79² =
  21. 21.58² =
  22. 22.31² =
  23. 23.51² =
  24. 24.55² =
  25. 25.66² =
  26. 26.57² =
  27. 27.45² =
  28. 28.93² =
  29. 29.87² =
  30. 30.47² =
  31. 31.61² =
  32. 32.54² =
  33. 33.33² =
  34. 34.78² =
  35. 35.95² =
  36. 36.76² =
  37. 37.69² =
  38. 38.88² =
  39. 39.62² =
  40. 40.99² =

Answer key

  1. 1764
  2. 1444
  3. 4489
  4. 1156
  5. 1225
  6. 6561
  7. 4624
  8. 1296
  9. 2116
  10. 7396
  11. 7056
  12. 2401
  13. 7921
  14. 2809
  15. 2304
  16. 7225
  17. 5041
  18. 8281
  19. 3969
  20. 6241
  21. 3364
  22. 961
  23. 2601
  24. 3025
  25. 4356
  26. 3249
  27. 2025
  28. 8649
  29. 7569
  30. 2209
  31. 3721
  32. 2916
  33. 1089
  34. 6084
  35. 9025
  36. 5776
  37. 4761
  38. 7744
  39. 3844
  40. 9801

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