# Rounding off numbers

This (Christmas) cookie themed partner activity, suitable for first and second grades, reinforces understanding of base ten, trading ten ones for one ten, and comparing two digit numbers. It also includes additional recording sheets with expanded form, rounding to the nearest ten, and counting by tens off a decade number. $

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Integer Card Game - Two students play together. They both draw two cards and add them, then play again with subtraction. Whoever has the higher number collects all four cards. -- Would be great especially for students who are having trouble understanding negative numbers/greater than and less than/adding and subtracting quickly.

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The Golden ratio is a number found by dividing a line into two parts so that the longer part divided by the smaller part is also equal to the whole length divided by the longer part. It is symbolized using phi, after the Greek alphabet. In an equation form, it looks like this: a/b = (a+b)/a = 1.618033988749894842 As with pi, the digits go on and on, theoretically into infinity. Phi is usually rounded off to 1.618.

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Christmas math activity (Color by Number) for 4th grade makes practicing multiplication, division, rounding, fractions, perimeter, area, factors, multiples, and prime numbers fun! Included are 6 different Christmas color by number math activities. Each activity addresses a different 4th grade math skill.

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