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Math Vocabulary Part One

Across
The number form written as the sum of its digits Ex. 900 + 40 + 1
Operations that undo each other Ex. 4+5=9 or 9-4=5
Where a digit is in a number, which tells its value Ex. ones, tens, hundreds
Numbers added together to find a sum Ex. 5 + 6 = 11
The property that says numbers can be added in any order and will have the same sum Ex. 8+3=3+8
The property of addition that says any number added to 0 equals that number Ex. 7+0=7
An answer that tells about how much Ex. 10+11 could be about 20 (an educated guess)
To break apart a number or equation Ex. 15x4=(10x4)+(5x4)
A missing number in an equation Ex. 5 x _=40
Down
The answer to a subtraction problem Ex. 10-5=5
The number form written as words Ex. nine hundred forty-one
The property that says numbers can be grouped any way and the sum will be the same Ex. (1+2)+3=1+(2+3)
Symbols used to write numbers Ex. 1, 2, 3, 4
A diagram that represents numbers as points on a line (in order).
To have the same value = is Ex. 3 = 1+2
The number form written so that it shows only digits Ex. 941
A letter used to represent an unknown number Ex. 5 x N = 40 where N = 8
A number sentence that uses an equal sign to show a value of a number Ex. 2x8=16