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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 175 · 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. 1.94² =
  2. 2.66² =
  3. 3.41² =
  4. 4.55² =
  5. 5.64² =
  6. 6.67² =
  7. 7.46² =
  8. 8.51² =
  9. 9.52² =
  10. 10.81² =
  11. 11.87² =
  12. 12.92² =
  13. 13.75² =
  14. 14.91² =
  15. 15.76² =
  16. 16.61² =
  17. 17.48² =
  18. 18.69² =
  19. 19.39² =
  20. 20.62² =
  21. 21.86² =
  22. 22.71² =
  23. 23.36² =
  24. 24.42² =
  25. 25.38² =
  26. 26.89² =
  27. 27.82² =
  28. 28.99² =
  29. 29.78² =
  30. 30.32² =
  31. 31.33² =
  32. 32.79² =
  33. 33.95² =
  34. 34.43² =
  35. 35.58² =
  36. 36.34² =
  37. 37.88² =
  38. 38.37² =
  39. 39.45² =
  40. 40.53² =

Answer key

  1. 8836
  2. 4356
  3. 1681
  4. 3025
  5. 4096
  6. 4489
  7. 2116
  8. 2601
  9. 2704
  10. 6561
  11. 7569
  12. 8464
  13. 5625
  14. 8281
  15. 5776
  16. 3721
  17. 2304
  18. 4761
  19. 1521
  20. 3844
  21. 7396
  22. 5041
  23. 1296
  24. 1764
  25. 1444
  26. 7921
  27. 6724
  28. 9801
  29. 6084
  30. 1024
  31. 1089
  32. 6241
  33. 9025
  34. 1849
  35. 3364
  36. 1156
  37. 7744
  38. 1369
  39. 2025
  40. 2809

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