← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 689 · 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. 1.19² =
  2. 2.39² =
  3. 3.29² =
  4. 4.61² =
  5. 5.69² =
  6. 6.89² =
  7. 7.51² =
  8. 8.49² =
  9. 9.79² =
  10. 10.79² =
  11. 11.31² =
  12. 12.21² =
  13. 13.31² =
  14. 14.69² =
  15. 15.71² =
  16. 16.59² =
  17. 17.49² =
  18. 18.29² =
  19. 19.51² =
  20. 20.19² =
  21. 21.59² =
  22. 22.41² =
  23. 23.89² =
  24. 24.61² =
  25. 25.39² =
  26. 26.31² =
  27. 27.51² =
  28. 28.41² =
  29. 29.79² =
  30. 30.29² =
  31. 31.39² =
  32. 32.41² =
  33. 33.31² =
  34. 34.31² =
  35. 35.41² =
  36. 36.71² =
  37. 37.89² =
  38. 38.61² =
  39. 39.89² =
  40. 40.59² =

Answer key

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

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