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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 488 · 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. 1.41² =
  2. 2.36² =
  3. 3.78² =
  4. 4.99² =
  5. 5.46² =
  6. 6.33² =
  7. 7.57² =
  8. 8.48² =
  9. 9.34² =
  10. 10.61² =
  11. 11.77² =
  12. 12.96² =
  13. 13.35² =
  14. 14.53² =
  15. 15.86² =
  16. 16.76² =
  17. 17.39² =
  18. 18.59² =
  19. 19.62² =
  20. 20.71² =
  21. 21.55² =
  22. 22.98² =
  23. 23.79² =
  24. 24.74² =
  25. 25.67² =
  26. 26.95² =
  27. 27.47² =
  28. 28.52² =
  29. 29.51² =
  30. 30.84² =
  31. 31.91² =
  32. 32.44² =
  33. 33.65² =
  34. 34.83² =
  35. 35.38² =
  36. 36.75² =
  37. 37.37² =
  38. 38.68² =
  39. 39.56² =
  40. 40.97² =

Answer key

  1. 1681
  2. 1296
  3. 6084
  4. 9801
  5. 2116
  6. 1089
  7. 3249
  8. 2304
  9. 1156
  10. 3721
  11. 5929
  12. 9216
  13. 1225
  14. 2809
  15. 7396
  16. 5776
  17. 1521
  18. 3481
  19. 3844
  20. 5041
  21. 3025
  22. 9604
  23. 6241
  24. 5476
  25. 4489
  26. 9025
  27. 2209
  28. 2704
  29. 2601
  30. 7056
  31. 8281
  32. 1936
  33. 4225
  34. 6889
  35. 1444
  36. 5625
  37. 1369
  38. 4624
  39. 3136
  40. 9409

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