← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 715 · 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. 1.41² =
  2. 2.19² =
  3. 3.21² =
  4. 4.19² =
  5. 5.39² =
  6. 6.79² =
  7. 7.59² =
  8. 8.39² =
  9. 9.61² =
  10. 10.39² =
  11. 11.69² =
  12. 12.31² =
  13. 13.59² =
  14. 14.89² =
  15. 15.69² =
  16. 16.59² =
  17. 17.21² =
  18. 18.29² =
  19. 19.79² =
  20. 20.19² =
  21. 21.31² =
  22. 22.41² =
  23. 23.29² =
  24. 24.51² =
  25. 25.21² =
  26. 26.91² =
  27. 27.59² =
  28. 28.39² =
  29. 29.21² =
  30. 30.79² =
  31. 31.29² =
  32. 32.59² =
  33. 33.29² =
  34. 34.81² =
  35. 35.29² =
  36. 36.89² =
  37. 37.21² =
  38. 38.89² =
  39. 39.39² =
  40. 40.19² =

Answer key

  1. 1681
  2. 361
  3. 441
  4. 361
  5. 1521
  6. 6241
  7. 3481
  8. 1521
  9. 3721
  10. 1521
  11. 4761
  12. 961
  13. 3481
  14. 7921
  15. 4761
  16. 3481
  17. 441
  18. 841
  19. 6241
  20. 361
  21. 961
  22. 1681
  23. 841
  24. 2601
  25. 441
  26. 8281
  27. 3481
  28. 1521
  29. 441
  30. 6241
  31. 841
  32. 3481
  33. 841
  34. 6561
  35. 841
  36. 7921
  37. 441
  38. 7921
  39. 1521
  40. 361

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