Addition & Subtraction
What are two ways to think about subtraction?
Up To or Take Away
Multiplication can be thought of as repeated _____ and Division as repeated _______ ?
Addition; Subtraction
How can you tell when a number is even? Odd?
Each part has a partner in an even number
What does borrowing mean?
Breaking down numbers to give to another place value
Explain why < means “less than” and why > means “greater than.”
If you move left on the number line, the numbers get smaller; if you move right on the number line, the numbers get bigger
If you don’t know 6+6, how can you solve it using 5+5?
5+5+2
What “tool” can we use to practice our 5s facts?
Clock
How many place values are there?
What does carrying mean?
What is quantity? What is denomination?
Quantity is the amount; denomination is the name
How can you solve 8+7 without counting by 1s?
Choose 1:
1. Doubles +/- 1
2. Add 10
3. Up to and Over 10
If we don’t know our 6s and 7s facts, what number can we use as a launching point?
5
What is our number system based on?
10
What is the Law of Sameness?
You can only add and subtract things with the same name.
What is the divisibility rule for 2? 3? 4? 5? 6? 10?
2 - even
3 - add digits together and see if sum is divisible by 3
4 - if you can take half of a number twice
5 - end in 5 or 0
6 - divisible by 2 and 3
10 - end in 0
How can you solve 4 + _ = 12 without counting by ones?
Up to and over 10
If we don’t know our 8s, 9s, 11s, and 12s facts, what number can we use as a launching point?
10
Can you take half of an odd number?
Yes; how?
What does estimating or rounding mean?
Getting close to the number so we can make the computation more manageable in our head
What does percent mean?
For each 100
How can you solve 999+999 without writing anything down?
1000+1000-2
What is another strategy for multiplying 6s and 8s?
Doubling
What does making change mean?
The difference between what is owed and what is paid
What is a factor? What is a multiple?
Factors = what you multiply
Multiples = the answer to a multiplication problem
FM Radio
What does absolute value mean?
Distance from zero