M

making ten strategy

A strategy that breaks a number into parts to make a ten with another number, making it easier to add or subtract. For example, to solve 8 + 4, break the 4 into 2 + 2 to make a ten with the 8 and then add 2 more.

math hopper

A special creature that moves from point to point on a number line. Math hoppers can move forward or backward.

measure

To find the size or amount of something.

median

The middle number in a list of numbers arranged in counting order. For an even number of data arranged in order, it is the number halfway between the two middle numbers.

minute

A unit of time that is equal to 60 seconds.

minute hand

The large hand on a clock that tells the minutes of the hour.

missing addend

The number missing in an addition sentence with a given sum.

model

Something that is made to look like another thing, often using different materials than the original object.