← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 659 · 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. 2.31² =
  3. 3.29² =
  4. 4.41² =
  5. 5.19² =
  6. 6.81² =
  7. 7.39² =
  8. 8.29² =
  9. 9.71² =
  10. 10.49² =
  11. 11.49² =
  12. 12.59² =
  13. 13.51² =
  14. 14.71² =
  15. 15.41² =
  16. 16.31² =
  17. 17.39² =
  18. 18.49² =
  19. 19.61² =
  20. 20.49² =
  21. 21.81² =
  22. 22.91² =
  23. 23.89² =
  24. 24.79² =
  25. 25.71² =
  26. 26.31² =
  27. 27.51² =
  28. 28.59² =
  29. 29.19² =
  30. 30.61² =
  31. 31.79² =
  32. 32.91² =
  33. 33.51² =
  34. 34.29² =
  35. 35.89² =
  36. 36.71² =
  37. 37.21² =
  38. 38.61² =
  39. 39.59² =
  40. 40.59² =

Answer key

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

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