← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 713 · 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. 1.51² =
  2. 2.31² =
  3. 3.69² =
  4. 4.21² =
  5. 5.59² =
  6. 6.39² =
  7. 7.79² =
  8. 8.79² =
  9. 9.89² =
  10. 10.49² =
  11. 11.39² =
  12. 12.91² =
  13. 13.19² =
  14. 14.41² =
  15. 15.31² =
  16. 16.79² =
  17. 17.29² =
  18. 18.49² =
  19. 19.19² =
  20. 20.41² =
  21. 21.59² =
  22. 22.29² =
  23. 23.41² =
  24. 24.51² =
  25. 25.31² =
  26. 26.19² =
  27. 27.81² =
  28. 28.91² =
  29. 29.81² =
  30. 30.31² =
  31. 31.21² =
  32. 32.21² =
  33. 33.19² =
  34. 34.19² =
  35. 35.29² =
  36. 36.19² =
  37. 37.89² =
  38. 38.49² =
  39. 39.79² =
  40. 40.41² =

Answer key

  1. 2601
  2. 961
  3. 4761
  4. 441
  5. 3481
  6. 1521
  7. 6241
  8. 6241
  9. 7921
  10. 2401
  11. 1521
  12. 8281
  13. 361
  14. 1681
  15. 961
  16. 6241
  17. 841
  18. 2401
  19. 361
  20. 1681
  21. 3481
  22. 841
  23. 1681
  24. 2601
  25. 961
  26. 361
  27. 6561
  28. 8281
  29. 6561
  30. 961
  31. 441
  32. 441
  33. 361
  34. 361
  35. 841
  36. 361
  37. 7921
  38. 2401
  39. 6241
  40. 1681

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