← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 532 · 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. 1.21² =
  2. 2.29² =
  3. 3.39² =
  4. 4.79² =
  5. 5.61² =
  6. 6.39² =
  7. 7.69² =
  8. 8.71² =
  9. 9.69² =
  10. 10.29² =
  11. 11.71² =
  12. 12.79² =
  13. 13.89² =
  14. 14.39² =
  15. 15.29² =
  16. 16.61² =
  17. 17.69² =
  18. 18.39² =
  19. 19.39² =
  20. 20.31² =
  21. 21.49² =
  22. 22.59² =
  23. 23.49² =
  24. 24.61² =
  25. 25.39² =
  26. 26.59² =
  27. 27.49² =
  28. 28.29² =
  29. 29.89² =
  30. 30.29² =
  31. 31.79² =
  32. 32.29² =
  33. 33.29² =
  34. 34.31² =
  35. 35.19² =
  36. 36.89² =
  37. 37.69² =
  38. 38.49² =
  39. 39.21² =
  40. 40.51² =

Answer key

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

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