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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 673 · 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. 1.31² =
  2. 2.32² =
  3. 3.34² =
  4. 4.89² =
  5. 5.51² =
  6. 6.98² =
  7. 7.36² =
  8. 8.69² =
  9. 9.47² =
  10. 10.33² =
  11. 11.37² =
  12. 12.94² =
  13. 13.78² =
  14. 14.45² =
  15. 15.35² =
  16. 16.88² =
  17. 17.91² =
  18. 18.87² =
  19. 19.71² =
  20. 20.75² =
  21. 21.57² =
  22. 22.41² =
  23. 23.74² =
  24. 24.86² =
  25. 25.66² =
  26. 26.38² =
  27. 27.97² =
  28. 28.43² =
  29. 29.72² =
  30. 30.93² =
  31. 31.64² =
  32. 32.44² =
  33. 33.61² =
  34. 34.95² =
  35. 35.99² =
  36. 36.76² =
  37. 37.79² =
  38. 38.83² =
  39. 39.82² =
  40. 40.62² =

Answer key

  1. 961
  2. 1024
  3. 1156
  4. 7921
  5. 2601
  6. 9604
  7. 1296
  8. 4761
  9. 2209
  10. 1089
  11. 1369
  12. 8836
  13. 6084
  14. 2025
  15. 1225
  16. 7744
  17. 8281
  18. 7569
  19. 5041
  20. 5625
  21. 3249
  22. 1681
  23. 5476
  24. 7396
  25. 4356
  26. 1444
  27. 9409
  28. 1849
  29. 5184
  30. 8649
  31. 4096
  32. 1936
  33. 3721
  34. 9025
  35. 9801
  36. 5776
  37. 6241
  38. 6889
  39. 6724
  40. 3844

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