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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 747 · 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. 1.61² =
  2. 2.76² =
  3. 3.59² =
  4. 4.81² =
  5. 5.91² =
  6. 6.98² =
  7. 7.47² =
  8. 8.41² =
  9. 9.86² =
  10. 10.43² =
  11. 11.44² =
  12. 12.42² =
  13. 13.72² =
  14. 14.99² =
  15. 15.93² =
  16. 16.63² =
  17. 17.32² =
  18. 18.45² =
  19. 19.66² =
  20. 20.51² =
  21. 21.58² =
  22. 22.68² =
  23. 23.71² =
  24. 24.52² =
  25. 25.79² =
  26. 26.33² =
  27. 27.48² =
  28. 28.88² =
  29. 29.65² =
  30. 30.69² =
  31. 31.34² =
  32. 32.95² =
  33. 33.39² =
  34. 34.35² =
  35. 35.96² =
  36. 36.94² =
  37. 37.92² =
  38. 38.83² =
  39. 39.89² =
  40. 40.55² =

Answer key

  1. 3721
  2. 5776
  3. 3481
  4. 6561
  5. 8281
  6. 9604
  7. 2209
  8. 1681
  9. 7396
  10. 1849
  11. 1936
  12. 1764
  13. 5184
  14. 9801
  15. 8649
  16. 3969
  17. 1024
  18. 2025
  19. 4356
  20. 2601
  21. 3364
  22. 4624
  23. 5041
  24. 2704
  25. 6241
  26. 1089
  27. 2304
  28. 7744
  29. 4225
  30. 4761
  31. 1156
  32. 9025
  33. 1521
  34. 1225
  35. 9216
  36. 8836
  37. 8464
  38. 6889
  39. 7921
  40. 3025

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