← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 916 · 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. 1.69² =
  2. 2.69² =
  3. 3.41² =
  4. 4.21² =
  5. 5.41² =
  6. 6.81² =
  7. 7.81² =
  8. 8.31² =
  9. 9.89² =
  10. 10.69² =
  11. 11.51² =
  12. 12.19² =
  13. 13.31² =
  14. 14.89² =
  15. 15.49² =
  16. 16.61² =
  17. 17.29² =
  18. 18.51² =
  19. 19.29² =
  20. 20.49² =
  21. 21.51² =
  22. 22.79² =
  23. 23.41² =
  24. 24.31² =
  25. 25.39² =
  26. 26.39² =
  27. 27.51² =
  28. 28.81² =
  29. 29.91² =
  30. 30.79² =
  31. 31.89² =
  32. 32.51² =
  33. 33.91² =
  34. 34.39² =
  35. 35.29² =
  36. 36.91² =
  37. 37.71² =
  38. 38.89² =
  39. 39.59² =
  40. 40.51² =

Answer key

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

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