← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 465 · 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. 1.61² =
  2. 2.91² =
  3. 3.31² =
  4. 4.19² =
  5. 5.61² =
  6. 6.39² =
  7. 7.79² =
  8. 8.21² =
  9. 9.39² =
  10. 10.29² =
  11. 11.51² =
  12. 12.49² =
  13. 13.91² =
  14. 14.79² =
  15. 15.71² =
  16. 16.81² =
  17. 17.79² =
  18. 18.29² =
  19. 19.31² =
  20. 20.61² =
  21. 21.21² =
  22. 22.91² =
  23. 23.61² =
  24. 24.39² =
  25. 25.59² =
  26. 26.51² =
  27. 27.89² =
  28. 28.29² =
  29. 29.31² =
  30. 30.31² =
  31. 31.19² =
  32. 32.19² =
  33. 33.31² =
  34. 34.79² =
  35. 35.91² =
  36. 36.19² =
  37. 37.39² =
  38. 38.69² =
  39. 39.19² =
  40. 40.29² =

Answer key

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

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