← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 810 · 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. 2.19² =
  3. 3.81² =
  4. 4.29² =
  5. 5.69² =
  6. 6.79² =
  7. 7.59² =
  8. 8.49² =
  9. 9.29² =
  10. 10.39² =
  11. 11.71² =
  12. 12.59² =
  13. 13.21² =
  14. 14.31² =
  15. 15.79² =
  16. 16.31² =
  17. 17.49² =
  18. 18.41² =
  19. 19.41² =
  20. 20.79² =
  21. 21.19² =
  22. 22.69² =
  23. 23.91² =
  24. 24.41² =
  25. 25.31² =
  26. 26.51² =
  27. 27.51² =
  28. 28.89² =
  29. 29.59² =
  30. 30.31² =
  31. 31.79² =
  32. 32.79² =
  33. 33.29² =
  34. 34.41² =
  35. 35.49² =
  36. 36.39² =
  37. 37.51² =
  38. 38.61² =
  39. 39.81² =
  40. 40.29² =

Answer key

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

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