← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 938 · 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. 2.89² =
  3. 3.29² =
  4. 4.81² =
  5. 5.19² =
  6. 6.79² =
  7. 7.61² =
  8. 8.31² =
  9. 9.89² =
  10. 10.89² =
  11. 11.21² =
  12. 12.29² =
  13. 13.89² =
  14. 14.79² =
  15. 15.81² =
  16. 16.79² =
  17. 17.31² =
  18. 18.91² =
  19. 19.49² =
  20. 20.19² =
  21. 21.21² =
  22. 22.91² =
  23. 23.59² =
  24. 24.69² =
  25. 25.39² =
  26. 26.79² =
  27. 27.61² =
  28. 28.81² =
  29. 29.21² =
  30. 30.59² =
  31. 31.51² =
  32. 32.31² =
  33. 33.71² =
  34. 34.61² =
  35. 35.71² =
  36. 36.19² =
  37. 37.31² =
  38. 38.41² =
  39. 39.69² =
  40. 40.89² =

Answer key

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

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