← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 419 · 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. 1.81² =
  2. 2.61² =
  3. 3.31² =
  4. 4.49² =
  5. 5.59² =
  6. 6.39² =
  7. 7.49² =
  8. 8.71² =
  9. 9.71² =
  10. 10.49² =
  11. 11.39² =
  12. 12.39² =
  13. 13.29² =
  14. 14.31² =
  15. 15.91² =
  16. 16.79² =
  17. 17.19² =
  18. 18.21² =
  19. 19.81² =
  20. 20.41² =
  21. 21.51² =
  22. 22.31² =
  23. 23.59² =
  24. 24.19² =
  25. 25.89² =
  26. 26.31² =
  27. 27.79² =
  28. 28.51² =
  29. 29.71² =
  30. 30.81² =
  31. 31.81² =
  32. 32.21² =
  33. 33.89² =
  34. 34.49² =
  35. 35.21² =
  36. 36.71² =
  37. 37.49² =
  38. 38.39² =
  39. 39.39² =
  40. 40.91² =

Answer key

  1. 6561
  2. 3721
  3. 961
  4. 2401
  5. 3481
  6. 1521
  7. 2401
  8. 5041
  9. 5041
  10. 2401
  11. 1521
  12. 1521
  13. 841
  14. 961
  15. 8281
  16. 6241
  17. 361
  18. 441
  19. 6561
  20. 1681
  21. 2601
  22. 961
  23. 3481
  24. 361
  25. 7921
  26. 961
  27. 6241
  28. 2601
  29. 5041
  30. 6561
  31. 6561
  32. 441
  33. 7921
  34. 2401
  35. 441
  36. 5041
  37. 2401
  38. 1521
  39. 1521
  40. 8281

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