← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 736 · 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. 1.19² =
  2. 2.51² =
  3. 3.89² =
  4. 4.81² =
  5. 5.41² =
  6. 6.79² =
  7. 7.39² =
  8. 8.49² =
  9. 9.91² =
  10. 10.31² =
  11. 11.89² =
  12. 12.39² =
  13. 13.29² =
  14. 14.89² =
  15. 15.41² =
  16. 16.21² =
  17. 17.91² =
  18. 18.49² =
  19. 19.39² =
  20. 20.39² =
  21. 21.59² =
  22. 22.29² =
  23. 23.19² =
  24. 24.61² =
  25. 25.89² =
  26. 26.49² =
  27. 27.29² =
  28. 28.29² =
  29. 29.59² =
  30. 30.49² =
  31. 31.39² =
  32. 32.69² =
  33. 33.29² =
  34. 34.91² =
  35. 35.29² =
  36. 36.39² =
  37. 37.89² =
  38. 38.31² =
  39. 39.91² =
  40. 40.31² =

Answer key

  1. 361
  2. 2601
  3. 7921
  4. 6561
  5. 1681
  6. 6241
  7. 1521
  8. 2401
  9. 8281
  10. 961
  11. 7921
  12. 1521
  13. 841
  14. 7921
  15. 1681
  16. 441
  17. 8281
  18. 2401
  19. 1521
  20. 1521
  21. 3481
  22. 841
  23. 361
  24. 3721
  25. 7921
  26. 2401
  27. 841
  28. 841
  29. 3481
  30. 2401
  31. 1521
  32. 4761
  33. 841
  34. 8281
  35. 841
  36. 1521
  37. 7921
  38. 961
  39. 8281
  40. 961

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