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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 164 · 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. 1.51² =
  2. 2.56² =
  3. 3.74² =
  4. 4.89² =
  5. 5.46² =
  6. 6.85² =
  7. 7.49² =
  8. 8.34² =
  9. 9.76² =
  10. 10.57² =
  11. 11.35² =
  12. 12.44² =
  13. 13.53² =
  14. 14.98² =
  15. 15.54² =
  16. 16.69² =
  17. 17.58² =
  18. 18.87² =
  19. 19.94² =
  20. 20.95² =
  21. 21.64² =
  22. 22.42² =
  23. 23.97² =
  24. 24.45² =
  25. 25.88² =
  26. 26.67² =
  27. 27.36² =
  28. 28.48² =
  29. 29.82² =
  30. 30.47² =
  31. 31.71² =
  32. 32.32² =
  33. 33.33² =
  34. 34.79² =
  35. 35.81² =
  36. 36.61² =
  37. 37.78² =
  38. 38.59² =
  39. 39.37² =
  40. 40.63² =

Answer key

  1. 2601
  2. 3136
  3. 5476
  4. 7921
  5. 2116
  6. 7225
  7. 2401
  8. 1156
  9. 5776
  10. 3249
  11. 1225
  12. 1936
  13. 2809
  14. 9604
  15. 2916
  16. 4761
  17. 3364
  18. 7569
  19. 8836
  20. 9025
  21. 4096
  22. 1764
  23. 9409
  24. 2025
  25. 7744
  26. 4489
  27. 1296
  28. 2304
  29. 6724
  30. 2209
  31. 5041
  32. 1024
  33. 1089
  34. 6241
  35. 6561
  36. 3721
  37. 6084
  38. 3481
  39. 1369
  40. 3969

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