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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 196 · 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. 1.37² =
  2. 2.43² =
  3. 3.51² =
  4. 4.31² =
  5. 5.49² =
  6. 6.81² =
  7. 7.98² =
  8. 8.39² =
  9. 9.67² =
  10. 10.41² =
  11. 11.59² =
  12. 12.96² =
  13. 13.42² =
  14. 14.38² =
  15. 15.46² =
  16. 16.86² =
  17. 17.89² =
  18. 18.68² =
  19. 19.48² =
  20. 20.69² =
  21. 21.94² =
  22. 22.75² =
  23. 23.62² =
  24. 24.63² =
  25. 25.91² =
  26. 26.66² =
  27. 27.52² =
  28. 28.35² =
  29. 29.55² =
  30. 30.76² =
  31. 31.74² =
  32. 32.83² =
  33. 33.64² =
  34. 34.32² =
  35. 35.73² =
  36. 36.87² =
  37. 37.71² =
  38. 38.33² =
  39. 39.84² =
  40. 40.79² =

Answer key

  1. 1369
  2. 1849
  3. 2601
  4. 961
  5. 2401
  6. 6561
  7. 9604
  8. 1521
  9. 4489
  10. 1681
  11. 3481
  12. 9216
  13. 1764
  14. 1444
  15. 2116
  16. 7396
  17. 7921
  18. 4624
  19. 2304
  20. 4761
  21. 8836
  22. 5625
  23. 3844
  24. 3969
  25. 8281
  26. 4356
  27. 2704
  28. 1225
  29. 3025
  30. 5776
  31. 5476
  32. 6889
  33. 4096
  34. 1024
  35. 5329
  36. 7569
  37. 5041
  38. 1089
  39. 7056
  40. 6241

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