Addition and Subtraction
30+58?
What is 88?
3. What place value is the 3 in?
What is the ones place?
1 x 25
What is 25? Any number times 1 is itself.
10 divided by 2?
What is 5?
78-27?
What is 51?
56, what place value is the 5 in?
What is the tens place?
4 x 4
What is 16?
25 divided by 5?
What is 5?
90-75
What is 15?
3,437. What place value is the 4 in?
What is the hundreds place?
11 x 2
What is 22?
24 divided by 6?
What is 4?
10 + 30 - 20?
What is 20?
You have to do 10+30 first! You would get... 40! Then you do 40-20 and get... 20!
12,369. What place value is the 2 in?
What is the thousands place?
12 x 3
What is 36?
100 divided by 10?
What is 10?
50 + 10 - 20 - 5?
What is 35?
We always have to go in order! We start by doing 50+10 which equals... 60! Then we subtract 20 since that what our problem tells us, so 60-20 equals... 40! Uh-oh, one more part left, we have to subtract 5 from 40! 40-5 equals... 35!
372,561. What place value is the 3 in?
What is hundred thousand?
Is 100 x 5 and 5 x 100 the same thing? How do you know?
What is yes? We know this because they have the same exact numbers in the two different multiplication problems!
Is 55 divided by 5 and 5 divided by 55 the same thing?