← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 820 · 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. 1.89² =
  2. 2.21² =
  3. 3.29² =
  4. 4.81² =
  5. 5.59² =
  6. 6.59² =
  7. 7.51² =
  8. 8.91² =
  9. 9.31² =
  10. 10.39² =
  11. 11.79² =
  12. 12.41² =
  13. 13.21² =
  14. 14.51² =
  15. 15.61² =
  16. 16.39² =
  17. 17.41² =
  18. 18.39² =
  19. 19.19² =
  20. 20.59² =
  21. 21.39² =
  22. 22.71² =
  23. 23.49² =
  24. 24.21² =
  25. 25.79² =
  26. 26.61² =
  27. 27.71² =
  28. 28.49² =
  29. 29.59² =
  30. 30.91² =
  31. 31.89² =
  32. 32.41² =
  33. 33.49² =
  34. 34.39² =
  35. 35.69² =
  36. 36.41² =
  37. 37.19² =
  38. 38.61² =
  39. 39.71² =
  40. 40.59² =

Answer key

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

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