a) Count in twos backwards in twos from 50 to 30 . b) Count in threes from 15 to 42 . d) Count backwards in threes from 63 to 39 . d) Count in tens from 520 to 780 . f) Count backwards in tens from 1000 to 560 . g) Count in nves from 105 to 225 . h) Count backwards in fives from 900 to 510 .

Starting at 50 and counting backwards in twos gives you: 50, 48, 46, 44, 42, 40, 38, 36, 34, and 32, stopping just before hitting 30. Isn’t it fun to see the numbers dance their way down? Now, if you’re counting in threes from 15 to 42, you’ll get: 15, 18, 21, 24, 27, 30, 33, 36, 39, and finally, you’ll reach 42. It’s like jogging on a number line—lots of room to roam! Continuing with counting backwards in threes from 63 to 39 nets you: 63, 60, 57, 54, 51, 48, 45, 42, and finally stopping at 39. Counting can truly be an adventure! Next, when counting in tens from 520 to 780, you get: 520, 530, 540, 550, 560, 570, 580, 590, 600, and zooming all the way to 780. It's like zooming along a highway of numbers! Now let's reverse it—counting backwards in tens from 1000 down to 560 goes like this: 1000, 990, 980, 970, 960, 950, 940, 930, and so on until you hit 560. Think of it as doing a moonwalk on the number line! Jumping into counting in nines from 105 to 225 results in: 105, 114, 123, 132, 141, 150, and so forth all the way to 225. It adds a bit of zing to your numbers! Lastly, counting backwards in fives from 900 to 510, you'll find: 900, 895, 890, and as you keep going, you’ll eventually land on 510. Think of it as deconstructing a Lego tower—one piece at a time!