← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 443 · 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. 1.59² =
  2. 2.31² =
  3. 3.81² =
  4. 4.91² =
  5. 5.89² =
  6. 6.31² =
  7. 7.69² =
  8. 8.79² =
  9. 9.51² =
  10. 10.69² =
  11. 11.89² =
  12. 12.51² =
  13. 13.29² =
  14. 14.89² =
  15. 15.71² =
  16. 16.81² =
  17. 17.91² =
  18. 18.69² =
  19. 19.49² =
  20. 20.61² =
  21. 21.71² =
  22. 22.29² =
  23. 23.29² =
  24. 24.91² =
  25. 25.59² =
  26. 26.49² =
  27. 27.71² =
  28. 28.41² =
  29. 29.61² =
  30. 30.31² =
  31. 31.51² =
  32. 32.39² =
  33. 33.61² =
  34. 34.59² =
  35. 35.89² =
  36. 36.89² =
  37. 37.21² =
  38. 38.51² =
  39. 39.49² =
  40. 40.91² =

Answer key

  1. 3481
  2. 961
  3. 6561
  4. 8281
  5. 7921
  6. 961
  7. 4761
  8. 6241
  9. 2601
  10. 4761
  11. 7921
  12. 2601
  13. 841
  14. 7921
  15. 5041
  16. 6561
  17. 8281
  18. 4761
  19. 2401
  20. 3721
  21. 5041
  22. 841
  23. 841
  24. 8281
  25. 3481
  26. 2401
  27. 5041
  28. 1681
  29. 3721
  30. 961
  31. 2601
  32. 1521
  33. 3721
  34. 3481
  35. 7921
  36. 7921
  37. 441
  38. 2601
  39. 2401
  40. 8281

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