← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 805 · 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. 1.79² =
  2. 2.21² =
  3. 3.29² =
  4. 4.39² =
  5. 5.81² =
  6. 6.49² =
  7. 7.41² =
  8. 8.21² =
  9. 9.51² =
  10. 10.51² =
  11. 11.81² =
  12. 12.49² =
  13. 13.61² =
  14. 14.51² =
  15. 15.31² =
  16. 16.59² =
  17. 17.79² =
  18. 18.91² =
  19. 19.29² =
  20. 20.81² =
  21. 21.59² =
  22. 22.21² =
  23. 23.91² =
  24. 24.71² =
  25. 25.89² =
  26. 26.19² =
  27. 27.29² =
  28. 28.19² =
  29. 29.91² =
  30. 30.79² =
  31. 31.59² =
  32. 32.41² =
  33. 33.81² =
  34. 34.49² =
  35. 35.49² =
  36. 36.51² =
  37. 37.89² =
  38. 38.71² =
  39. 39.19² =
  40. 40.19² =

Answer key

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

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