← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 543 · 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. 1.29² =
  2. 2.81² =
  3. 3.61² =
  4. 4.51² =
  5. 5.59² =
  6. 6.41² =
  7. 7.21² =
  8. 8.49² =
  9. 9.89² =
  10. 10.89² =
  11. 11.31² =
  12. 12.29² =
  13. 13.29² =
  14. 14.71² =
  15. 15.41² =
  16. 16.21² =
  17. 17.69² =
  18. 18.61² =
  19. 19.79² =
  20. 20.89² =
  21. 21.81² =
  22. 22.41² =
  23. 23.21² =
  24. 24.71² =
  25. 25.49² =
  26. 26.61² =
  27. 27.39² =
  28. 28.41² =
  29. 29.31² =
  30. 30.29² =
  31. 31.79² =
  32. 32.19² =
  33. 33.29² =
  34. 34.79² =
  35. 35.81² =
  36. 36.89² =
  37. 37.71² =
  38. 38.89² =
  39. 39.51² =
  40. 40.89² =

Answer key

  1. 841
  2. 6561
  3. 3721
  4. 2601
  5. 3481
  6. 1681
  7. 441
  8. 2401
  9. 7921
  10. 7921
  11. 961
  12. 841
  13. 841
  14. 5041
  15. 1681
  16. 441
  17. 4761
  18. 3721
  19. 6241
  20. 7921
  21. 6561
  22. 1681
  23. 441
  24. 5041
  25. 2401
  26. 3721
  27. 1521
  28. 1681
  29. 961
  30. 841
  31. 6241
  32. 361
  33. 841
  34. 6241
  35. 6561
  36. 7921
  37. 5041
  38. 7921
  39. 2601
  40. 7921

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