← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 826 · 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. 1.91² =
  2. 2.89² =
  3. 3.89² =
  4. 4.59² =
  5. 5.89² =
  6. 6.41² =
  7. 7.51² =
  8. 8.51² =
  9. 9.89² =
  10. 10.79² =
  11. 11.41² =
  12. 12.51² =
  13. 13.61² =
  14. 14.51² =
  15. 15.29² =
  16. 16.69² =
  17. 17.49² =
  18. 18.81² =
  19. 19.29² =
  20. 20.19² =
  21. 21.89² =
  22. 22.89² =
  23. 23.39² =
  24. 24.79² =
  25. 25.19² =
  26. 26.29² =
  27. 27.71² =
  28. 28.51² =
  29. 29.79² =
  30. 30.49² =
  31. 31.19² =
  32. 32.59² =
  33. 33.19² =
  34. 34.19² =
  35. 35.21² =
  36. 36.39² =
  37. 37.41² =
  38. 38.61² =
  39. 39.89² =
  40. 40.81² =

Answer key

  1. 8281
  2. 7921
  3. 7921
  4. 3481
  5. 7921
  6. 1681
  7. 2601
  8. 2601
  9. 7921
  10. 6241
  11. 1681
  12. 2601
  13. 3721
  14. 2601
  15. 841
  16. 4761
  17. 2401
  18. 6561
  19. 841
  20. 361
  21. 7921
  22. 7921
  23. 1521
  24. 6241
  25. 361
  26. 841
  27. 5041
  28. 2601
  29. 6241
  30. 2401
  31. 361
  32. 3481
  33. 361
  34. 361
  35. 441
  36. 1521
  37. 1681
  38. 3721
  39. 7921
  40. 6561

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