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About
Overview
Authors & Advisors
Related Publications
Math + Programming
Think Math!
Math Routines
Mental Math
Headline Stories
Math Library
Ratios & Proportional Relationships
November 20, 2019
Factor
The terms factor and multiple are sometimes confused with each other. Factors of 15 include 3 and 5; multiples of 15 include 30, 45, 60 (and
[…]
November 20, 2019
Prime Numbers
Any counting number, other than 1, can be built by adding two or more smaller counting numbers. But only some counting numbers can be composed by multiplying two or more smaller counting numbers.
November 20, 2019
Multiple
Question: Children (and adults) are often uncertain whether the multiples of, say, 12 are the numbers one can multiply (like 3 and 4) to make 12,
[…]