whole numbers
the set of counting numbers and zero (0, 1, 2, 3, 4, .....)
thousandth
one of 1,000 equal parts; the third place to the right of the decimal point
tenth
one of 10 equal parts; the first place to the right of the decimal point
round
to approximate a number to a given place value
reasonable
logical or sensible
place value
the value determined by the position of a digit in a number
mixed number
a number composed of a whole number and a fraction
improper fraction
a fraction in which the numerator is greater than or equal to the denominator
hundredth
one of 100 equal parts; the second place to the right of the decimal point
front-end estimation
an estimation made using the front-end of a digit number
fraction
a number that names a part of a whole or part of a group
estimate
an answer that is close to the exact answer; to guess about
digit
one of the symbols 0,1,2,3,4,5,6,7,8, and 9 used to write numbers
decimal point
the dot used to separate the ones place from the tenths place in a decimal number
decimal number
a number that uses a decimal point to show tenths, hundredths, and thousandths
compensation
an estimation strategy in which numbers are rounded and then mentally adjusted
compatible numbers
pairs of numbers that can be easily computed mentally
approximate
to estimate; to come close to; almost exact or correct