← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 929 · 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. 1.51² =
  2. 2.21² =
  3. 3.29² =
  4. 4.91² =
  5. 5.89² =
  6. 6.49² =
  7. 7.59² =
  8. 8.69² =
  9. 9.21² =
  10. 10.61² =
  11. 11.89² =
  12. 12.91² =
  13. 13.81² =
  14. 14.79² =
  15. 15.31² =
  16. 16.79² =
  17. 17.79² =
  18. 18.59² =
  19. 19.21² =
  20. 20.49² =
  21. 21.21² =
  22. 22.29² =
  23. 23.89² =
  24. 24.21² =
  25. 25.71² =
  26. 26.59² =
  27. 27.79² =
  28. 28.71² =
  29. 29.71² =
  30. 30.49² =
  31. 31.39² =
  32. 32.49² =
  33. 33.51² =
  34. 34.61² =
  35. 35.29² =
  36. 36.89² =
  37. 37.51² =
  38. 38.81² =
  39. 39.19² =
  40. 40.31² =

Answer key

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

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