← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 199 · 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. 1.31² =
  2. 2.51² =
  3. 3.59² =
  4. 4.89² =
  5. 5.89² =
  6. 6.91² =
  7. 7.59² =
  8. 8.41² =
  9. 9.41² =
  10. 10.59² =
  11. 11.89² =
  12. 12.69² =
  13. 13.21² =
  14. 14.21² =
  15. 15.81² =
  16. 16.91² =
  17. 17.29² =
  18. 18.19² =
  19. 19.69² =
  20. 20.61² =
  21. 21.91² =
  22. 22.31² =
  23. 23.89² =
  24. 24.39² =
  25. 25.41² =
  26. 26.41² =
  27. 27.41² =
  28. 28.21² =
  29. 29.91² =
  30. 30.29² =
  31. 31.69² =
  32. 32.49² =
  33. 33.19² =
  34. 34.79² =
  35. 35.61² =
  36. 36.61² =
  37. 37.89² =
  38. 38.49² =
  39. 39.79² =
  40. 40.81² =

Answer key

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

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