Math Stories
Every answer must have an _______
unit
The answer to an addition problem is called the _______
sum
The answer is to a subtraction problem is called the ____
difference
2 X1=?
2
0X100=
0
When you compare, what operation do you use ?
subtraction
How many addends are in the equation:
100+230+15
3
45-10=?
35
6 X 4=?
24
7X11=
77
name 3 addition/subtraction strategies
invented equation, open number line, drawing a model/ place value blocks, standard algorithm
solve 150+150=
300
You use _____ ______ when you regroup. This is an older strategy.
standard algorithm
You can use repeated addition to help you _____
multiply
use repeated subtraction to solve: 36 / 6=
6
The word some means the value is _____
unknown, not known
125+212+75=
412
How do you know when you need to regroup?
When you do not have enough to subtract, when the top number is less than the bottom number
80/ 10=
8
345+265=
610
name all math stories strategies:
teacher tells story, 3 students retell, students work independently for 15 minutes, students chart, students complete exit ticket
solve using standand algorithm : 75 +63=
138
solve 35-17
18
54 /9=?
6
231-127=
104