← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 368 · 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. 1.29² =
  2. 2.29² =
  3. 3.89² =
  4. 4.89² =
  5. 5.81² =
  6. 6.81² =
  7. 7.39² =
  8. 8.69² =
  9. 9.41² =
  10. 10.31² =
  11. 11.41² =
  12. 12.51² =
  13. 13.79² =
  14. 14.39² =
  15. 15.61² =
  16. 16.19² =
  17. 17.49² =
  18. 18.31² =
  19. 19.51² =
  20. 20.81² =
  21. 21.89² =
  22. 22.39² =
  23. 23.91² =
  24. 24.51² =
  25. 25.61² =
  26. 26.41² =
  27. 27.71² =
  28. 28.69² =
  29. 29.41² =
  30. 30.21² =
  31. 31.51² =
  32. 32.91² =
  33. 33.41² =
  34. 34.69² =
  35. 35.39² =
  36. 36.81² =
  37. 37.59² =
  38. 38.19² =
  39. 39.69² =
  40. 40.39² =

Answer key

  1. 841
  2. 841
  3. 7921
  4. 7921
  5. 6561
  6. 6561
  7. 1521
  8. 4761
  9. 1681
  10. 961
  11. 1681
  12. 2601
  13. 6241
  14. 1521
  15. 3721
  16. 361
  17. 2401
  18. 961
  19. 2601
  20. 6561
  21. 7921
  22. 1521
  23. 8281
  24. 2601
  25. 3721
  26. 1681
  27. 5041
  28. 4761
  29. 1681
  30. 441
  31. 2601
  32. 8281
  33. 1681
  34. 4761
  35. 1521
  36. 6561
  37. 3481
  38. 361
  39. 4761
  40. 1521

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