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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 349 · 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. 1.72² =
  2. 2.95² =
  3. 3.56² =
  4. 4.39² =
  5. 5.38² =
  6. 6.89² =
  7. 7.81² =
  8. 8.91² =
  9. 9.34² =
  10. 10.44² =
  11. 11.45² =
  12. 12.61² =
  13. 13.88² =
  14. 14.41² =
  15. 15.46² =
  16. 16.51² =
  17. 17.71² =
  18. 18.43² =
  19. 19.47² =
  20. 20.82² =
  21. 21.49² =
  22. 22.93² =
  23. 23.59² =
  24. 24.36² =
  25. 25.83² =
  26. 26.96² =
  27. 27.52² =
  28. 28.97² =
  29. 29.48² =
  30. 30.75² =
  31. 31.37² =
  32. 32.54² =
  33. 33.67² =
  34. 34.79² =
  35. 35.78² =
  36. 36.84² =
  37. 37.63² =
  38. 38.53² =
  39. 39.89² =
  40. 40.74² =

Answer key

  1. 5184
  2. 9025
  3. 3136
  4. 1521
  5. 1444
  6. 7921
  7. 6561
  8. 8281
  9. 1156
  10. 1936
  11. 2025
  12. 3721
  13. 7744
  14. 1681
  15. 2116
  16. 2601
  17. 5041
  18. 1849
  19. 2209
  20. 6724
  21. 2401
  22. 8649
  23. 3481
  24. 1296
  25. 6889
  26. 9216
  27. 2704
  28. 9409
  29. 2304
  30. 5625
  31. 1369
  32. 2916
  33. 4489
  34. 6241
  35. 6084
  36. 7056
  37. 3969
  38. 2809
  39. 7921
  40. 5476

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