21/3 = 7
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24/3 = 8
1 x 21 3 x 7 7 x 3 21 x 1
Yes, 21 can be divided into equal groups. 21 is divisible by 1, 3, 7, and 21. Therefore, you can divide 21 into 1 group of 21, 3 groups of 7, 7 groups of 3, or 21 groups of 1, with each group being equal in size.
3
3 yard is equal to 9 feet, so 3 yards is less than 21 feet.