Lesson

Number of exercises: 121

Number of subscribers: 0

Exercises

Question | Answer |
---|---|

20 x 20 | 400 |

20 x 21 | 420 |

20 x 22 | 440 |

20 x 23 | 460 |

20 x 24 | 480 |

20 x 25 | 500 |

20 x 26 | 520 |

20 x 27 | 540 |

20 x 28 | 560 |

20 x 29 | 580 |

20 x 30 | 600 |

21 x 20 | 420 |

21 x 21 | 441 |

21 x 22 | 462 |

21 x 23 | 483 |

21 x 24 | 504 |

21 x 25 | 525 |

21 x 26 | 546 |

21 x 27 | 567 |

21 x 28 | 588 |

21 x 29 | 609 |

21 x 30 | 630 |

22 x 20 | 440 |

22 x 21 | 462 |

22 x 22 | 484 |

22 x 23 | 506 |

22 x 24 | 528 |

22 x 25 | 550 |

22 x 26 | 572 |

22 x 27 | 594 |

22 x 28 | 616 |

22 x 29 | 638 |

22 x 30 | 660 |

23 x 20 | 460 |

23 x 21 | 483 |

23 x 22 | 506 |

23 x 23 | 529 |

23 x 24 | 552 |

23 x 25 | 575 |

23 x 26 | 598 |

23 x 27 | 621 |

23 x 28 | 644 |

23 x 29 | 667 |

23 x 30 | 690 |

24 x 20 | 480 |

24 x 21 | 504 |

24 x 22 | 528 |

24 x 23 | 552 |

24 x 24 | 576 |

24 x 25 | 600 |

24 x 26 | 624 |

24 x 27 | 648 |

24 x 28 | 672 |

24 x 29 | 696 |

24 x 30 | 720 |

25 x 20 | 500 |

25 x 21 | 525 |

25 x 22 | 550 |

25 x 23 | 575 |

25 x 24 | 600 |

25 x 25 | 625 |

25 x 26 | 650 |

25 x 27 | 675 |

25 x 28 | 700 |

25 x 29 | 725 |

25 x 30 | 750 |

26 x 20 | 520 |

26 x 21 | 546 |

26 x 22 | 572 |

26 x 23 | 598 |

26 x 24 | 624 |

26 x 25 | 650 |

26 x 26 | 676 |

26 x 27 | 702 |

26 x 28 | 728 |

26 x 29 | 754 |

26 x 30 | 780 |

27 x 20 | 540 |

27 x 21 | 567 |

27 x 22 | 594 |

27 x 23 | 621 |

27 x 24 | 648 |

27 x 25 | 675 |

27 x 26 | 702 |

27 x 27 | 729 |

27 x 28 | 756 |

27 x 29 | 783 |

27 x 30 | 810 |

28 x 20 | 560 |

28 x 21 | 588 |

28 x 22 | 616 |

28 x 23 | 644 |

28 x 24 | 672 |

28 x 25 | 700 |

28 x 26 | 728 |

28 x 27 | 756 |

28 x 28 | 784 |

28 x 29 | 812 |

28 x 30 | 840 |

29 x 20 | 580 |

29 x 21 | 609 |

29 x 22 | 638 |

29 x 23 | 667 |

29 x 24 | 696 |

29 x 25 | 725 |

29 x 26 | 754 |

29 x 27 | 783 |

29 x 28 | 812 |

29 x 29 | 841 |

29 x 30 | 870 |

30 x 20 | 600 |

30 x 21 | 630 |

30 x 22 | 660 |

30 x 23 | 690 |

30 x 24 | 720 |

30 x 25 | 750 |

30 x 26 | 780 |

30 x 27 | 810 |

30 x 28 | 840 |

30 x 29 | 870 |

30 x 30 | 900 |