← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 974 · 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. 2.29² =
  3. 3.69² =
  4. 4.69² =
  5. 5.69² =
  6. 6.59² =
  7. 7.51² =
  8. 8.79² =
  9. 9.21² =
  10. 10.51² =
  11. 11.39² =
  12. 12.91² =
  13. 13.91² =
  14. 14.31² =
  15. 15.59² =
  16. 16.39² =
  17. 17.89² =
  18. 18.51² =
  19. 19.19² =
  20. 20.51² =
  21. 21.71² =
  22. 22.21² =
  23. 23.81² =
  24. 24.61² =
  25. 25.29² =
  26. 26.31² =
  27. 27.51² =
  28. 28.29² =
  29. 29.21² =
  30. 30.19² =
  31. 31.71² =
  32. 32.21² =
  33. 33.29² =
  34. 34.19² =
  35. 35.31² =
  36. 36.49² =
  37. 37.79² =
  38. 38.79² =
  39. 39.29² =
  40. 40.39² =

Answer key

  1. 841
  2. 841
  3. 4761
  4. 4761
  5. 4761
  6. 3481
  7. 2601
  8. 6241
  9. 441
  10. 2601
  11. 1521
  12. 8281
  13. 8281
  14. 961
  15. 3481
  16. 1521
  17. 7921
  18. 2601
  19. 361
  20. 2601
  21. 5041
  22. 441
  23. 6561
  24. 3721
  25. 841
  26. 961
  27. 2601
  28. 841
  29. 441
  30. 361
  31. 5041
  32. 441
  33. 841
  34. 361
  35. 961
  36. 2401
  37. 6241
  38. 6241
  39. 841
  40. 1521

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