← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 501 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.21² =
  2. 2.51² =
  3. 3.39² =
  4. 4.89² =
  5. 5.29² =
  6. 6.39² =
  7. 7.19² =
  8. 8.19² =
  9. 9.71² =
  10. 10.81² =
  11. 11.91² =
  12. 12.21² =
  13. 13.19² =
  14. 14.89² =
  15. 15.79² =
  16. 16.29² =
  17. 17.21² =
  18. 18.39² =
  19. 19.39² =
  20. 20.49² =
  21. 21.49² =
  22. 22.69² =
  23. 23.51² =
  24. 24.21² =
  25. 25.21² =
  26. 26.89² =
  27. 27.69² =
  28. 28.49² =
  29. 29.69² =
  30. 30.41² =
  31. 31.19² =
  32. 32.41² =
  33. 33.61² =
  34. 34.59² =
  35. 35.71² =
  36. 36.41² =
  37. 37.81² =
  38. 38.29² =
  39. 39.49² =
  40. 40.61² =

Answer key

  1. 441
  2. 2601
  3. 1521
  4. 7921
  5. 841
  6. 1521
  7. 361
  8. 361
  9. 5041
  10. 6561
  11. 8281
  12. 441
  13. 361
  14. 7921
  15. 6241
  16. 841
  17. 441
  18. 1521
  19. 1521
  20. 2401
  21. 2401
  22. 4761
  23. 2601
  24. 441
  25. 441
  26. 7921
  27. 4761
  28. 2401
  29. 4761
  30. 1681
  31. 361
  32. 1681
  33. 3721
  34. 3481
  35. 5041
  36. 1681
  37. 6561
  38. 841
  39. 2401
  40. 3721

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths