1. Math Vocabulary

2. Comma
“million”
“thousand”
UNITS
Used to separate the periods; when you see a comma, say the name of the period

3. Smaller than the size or amount.
Less than
Smaller than the size or amount.
Small
Big

4. More than the size or amount.
Greater than
More than the size or amount.

5. To find an answer that is close to the actual answer.
Estimation
To find an answer that is close to the actual answer.

6. Estimation “Round, About & Estimate”
(To the tune of “Mary Had a Little Lamb”)
Round, About & Estimate, Estimate, Estimate,
Reasonable, Best Way,
Approximately!

7. 33 rounded to the nearest ten is 30.
Rounding
33 is closer to 30 than 40.
33 rounded to the nearest ten is 30.
An estimation strategy to find a number that is close to the actual number.

8. Compatible Numbers Numbers that are easy to compute with mentally.
4 and 6 are compatible because they add up to 10.
25 and 75 are compatible because they add up to 100.
Also known as “Friendly Numbers”

9. The answer you get when you add.
Sum
The answer you get when you add.
5 + 4 = 9
The sum is 9.

10. A number that is added to another number.
Addend
A number that is added to another number.
5 + 4 = 9
The addends are 5 and 4.

11. The answer you get when you subtract.
Difference
The answer you get when you subtract.
9 – 5 = 4
The difference is 4.

12. The first number in a subtraction sentence.
Minuend
The first number in a subtraction sentence.
9 – 5 = 4
The minuend is 9.

13. The second number in a subtraction sentence.
Subtrahend
The second number in a subtraction sentence.
9 – 5 = 4
The subtrahend is 5.

14. Digit
Any number from 0-9.

15. Whole Number
Any counting number from zero to infinity.

16. Place Value
The position that each digit occupies.

17. Period
UNITS
A three-digit grouping of a number on a place value chart that represents its value.

18. Standard Form
The regular way of writing numbers.

19. Expanded Form
A way of writing numbers to show place value.
9,356

20. A way of writing numbers in words.
Written Form
A way of writing numbers in words.
9,356
Nine thousand, three hundred fifty-six

21. Equal to
The same value.

22. Greater than
More than the size or amount.

23. Less than
Smaller than the size or amount.
Big
Small

24. Decimal
Another name for a decimal fraction that uses place value, numbers, and a decimal point to show part of a whole.

25. Tenths
One part of one ten divided into 10 equal parts. .1
.10 or
.100

26. Hundredths One part of one hundred divided into 100 equal parts. .01
.010 or

27. Perimeter
The distance around a shape or region.
10 cm
8 cm
8 cm
10 cm

28. Base-ten system
A number system of multiples of 10, where each digit has 10 times the value of the same digit one place to its right.