N
net
A way of representing the surface of a three-dimensional solid in two-dimensions. A net can be made by cutting the surface of a 3-D shape along edges until it can be laid flat showing all faces at once.
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Another word for zero.
page 217
number line
A line where numbers are marked at regular intervals used for counting, calculating, and comparing numbers.
pages 7, 14, 16–17, 47–48, 86–90, 122, 126, 150–151, 156, 166, 196, 198, 199, 262–263, 284–286
number sentence
An equation or inequality that includes numbers and operations. For example, 3 × 2 + 5 = 10 + 1 and 2 < 3 + 1.
pages 14, 20, 22, 23, 43, 45, 47, 48, 53, 55, 57, 58, 62, 63, 64, 65, 67, 72, 74, 77, 78, 83, 84, 85, 88, 90, 127, 130, 156, 166, 197, 198, 202, 203, 206, 235, 236, 247, 282, 284, 285, 286, 361, 386, 407, 412 The number written above the line in a fraction. It tells how many equal parts of the whole you have. For example, 3 is the numerator in the fraction (See also denominator.) pages 258, 261–263numerator
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