Knowledge of place value is essential when comparing numbers.
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Determine the closest ten. – If the number in the ones place is 5 (halfway between the two tens), round the number to the higher ten.
Compare two numbers between 0 and 999 represented pictorially or with concrete objects (e.g., Base-10 blocks), using the words greater than, less than or equal to.
Opportunities to experience the relationships among hundreds, tens, and ones through hands-on experiences with manipulatives are essential to developing the ten-to-one place value concept of our number system and to understanding the value of each digit in a three-digit number. This structure is helpful when comparing and ordering numbers.
Rounding a number to the nearest ten means determining which two tens the number lies between and then which ten the number is closest to (e.g., 48 is between 40 and 50 and rounded to the nearest ten is 50, because 48 is closer to 50 than it is to 40).
Mathematical symbols (>, <) used to compare two unequal numbers are called inequality symbols.