← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 515 · 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. 2.89² =
  3. 3.91² =
  4. 4.69² =
  5. 5.91² =
  6. 6.31² =
  7. 7.41² =
  8. 8.51² =
  9. 9.91² =
  10. 10.69² =
  11. 11.49² =
  12. 12.61² =
  13. 13.29² =
  14. 14.89² =
  15. 15.89² =
  16. 16.89² =
  17. 17.79² =
  18. 18.39² =
  19. 19.21² =
  20. 20.69² =
  21. 21.49² =
  22. 22.41² =
  23. 23.31² =
  24. 24.49² =
  25. 25.61² =
  26. 26.41² =
  27. 27.41² =
  28. 28.91² =
  29. 29.21² =
  30. 30.19² =
  31. 31.91² =
  32. 32.39² =
  33. 33.21² =
  34. 34.91² =
  35. 35.81² =
  36. 36.31² =
  37. 37.19² =
  38. 38.21² =
  39. 39.59² =
  40. 40.91² =

Answer key

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

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