← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 494 · 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. 1.49² =
  2. 2.61² =
  3. 3.51² =
  4. 4.59² =
  5. 5.79² =
  6. 6.69² =
  7. 7.79² =
  8. 8.39² =
  9. 9.29² =
  10. 10.71² =
  11. 11.51² =
  12. 12.39² =
  13. 13.59² =
  14. 14.49² =
  15. 15.49² =
  16. 16.71² =
  17. 17.19² =
  18. 18.19² =
  19. 19.31² =
  20. 20.91² =
  21. 21.29² =
  22. 22.91² =
  23. 23.21² =
  24. 24.19² =
  25. 25.19² =
  26. 26.61² =
  27. 27.29² =
  28. 28.81² =
  29. 29.89² =
  30. 30.89² =
  31. 31.51² =
  32. 32.21² =
  33. 33.71² =
  34. 34.51² =
  35. 35.61² =
  36. 36.79² =
  37. 37.91² =
  38. 38.41² =
  39. 39.79² =
  40. 40.69² =

Answer key

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

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