← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 814 · 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. 2.61² =
  3. 3.19² =
  4. 4.81² =
  5. 5.39² =
  6. 6.19² =
  7. 7.29² =
  8. 8.71² =
  9. 9.41² =
  10. 10.31² =
  11. 11.49² =
  12. 12.19² =
  13. 13.59² =
  14. 14.31² =
  15. 15.19² =
  16. 16.69² =
  17. 17.79² =
  18. 18.81² =
  19. 19.41² =
  20. 20.29² =
  21. 21.61² =
  22. 22.29² =
  23. 23.49² =
  24. 24.89² =
  25. 25.39² =
  26. 26.49² =
  27. 27.49² =
  28. 28.21² =
  29. 29.29² =
  30. 30.81² =
  31. 31.51² =
  32. 32.79² =
  33. 33.41² =
  34. 34.41² =
  35. 35.39² =
  36. 36.39² =
  37. 37.19² =
  38. 38.81² =
  39. 39.79² =
  40. 40.51² =

Answer key

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

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