# Number Blocks: All About Four

Numbers are used to record amounts or quantities. Learning numbers is essential for kids, because it is the very first step of a kid entering into mathematics. Learning numbers includes understanding their quantity, their relationships with each other, and how they are affected by operations. Kids need to be provided with a lot of exercise in learning numbers.

This worksheet is all about the number 4. It illustrates the geometric shapes composed of four square blocks, and also the operations involving number 4. A tetromino is a polyomino made of four squares, that is, puting four squares connected together on sides. There are 5 different tetrominoes, and all 5 tetrominoes together can fit a 3-by-7 rectangle with a hole in the middle. The operations involving 4 are demonstrated by number blocks: 1 plus 3 makes 4; 2 plus 2 makes 4; 3 plus 1 makes 4; 1 times 4 makes 4; 4 times 1 makes 4; 2 times 2 makes 4; 2 times 4 makes 8; 3 times 4 makes 12; 4 times 4 makes 16; 5 times 4 makes 20. This sheet is a great visual tool for kids to practice counting, connect numbers, and learn basic operations and geometric concepts.

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