← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 422 · 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. 3.89² =
  4. 4.19² =
  5. 5.81² =
  6. 6.39² =
  7. 7.39² =
  8. 8.19² =
  9. 9.41² =
  10. 10.31² =
  11. 11.51² =
  12. 12.21² =
  13. 13.79² =
  14. 14.61² =
  15. 15.41² =
  16. 16.31² =
  17. 17.21² =
  18. 18.79² =
  19. 19.19² =
  20. 20.61² =
  21. 21.41² =
  22. 22.39² =
  23. 23.41² =
  24. 24.41² =
  25. 25.51² =
  26. 26.21² =
  27. 27.49² =
  28. 28.81² =
  29. 29.41² =
  30. 30.39² =
  31. 31.29² =
  32. 32.41² =
  33. 33.29² =
  34. 34.21² =
  35. 35.51² =
  36. 36.39² =
  37. 37.79² =
  38. 38.19² =
  39. 39.71² =
  40. 40.39² =

Answer key

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

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