One dollar can be made by adding the values of the following 21 U.S. coins:
10 pennies (10 ¢)
7 nickels (35 ¢)
3 dimes (30 ¢)
1 quarter (25 ¢)
There are also many other possible configurations including:
10 pennies (10 ¢)
4 nickels (20 ¢)
7 dimes (70 ¢)
and
5 pennies (5 ¢)
13 nickels (65 ¢)
3 dimes (30 ¢)
3 dollar 3 coins
10 x 10c coins
half dollar, quarter four dimes
impossible.
nine
You cant unless you have 100 pennies.
I'd say you can't. If all the coins are the smallest possible without pennies, they must all be nickels, and 21 of them make $1.05 . So in order for 21 coins to be not more than $1.00, there must be some pennies.
3 dollar 3 coins
(1) $0.50 (2) $0.10 (3) $0.05 (15) $0.01
3 dimes 13 nickles 5 pennies
20 5 cents coins
Not in the US.
5*20 cents (Australian) make a dollar. In US and Canadian coins, a 50 cent piece, a quarter, two dimes, and a nickel also make a dollar.
5 dimes and 10 nickels make 1 dollar.
10 x 10c coins
21 pennies
half dollar, quarter four dimes