← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 94 · 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. 1.51² =
  2. 2.39² =
  3. 3.39² =
  4. 4.19² =
  5. 5.49² =
  6. 6.69² =
  7. 7.41² =
  8. 8.29² =
  9. 9.21² =
  10. 10.39² =
  11. 11.29² =
  12. 12.31² =
  13. 13.49² =
  14. 14.79² =
  15. 15.49² =
  16. 16.69² =
  17. 17.71² =
  18. 18.51² =
  19. 19.39² =
  20. 20.19² =
  21. 21.61² =
  22. 22.59² =
  23. 23.79² =
  24. 24.39² =
  25. 25.71² =
  26. 26.79² =
  27. 27.41² =
  28. 28.81² =
  29. 29.41² =
  30. 30.69² =
  31. 31.49² =
  32. 32.31² =
  33. 33.29² =
  34. 34.59² =
  35. 35.89² =
  36. 36.41² =
  37. 37.29² =
  38. 38.71² =
  39. 39.51² =
  40. 40.19² =

Answer key

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

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