I Think I Know.
The Grade Level Math Standard: Know from memory all products of two one-digit numbers.
What is the 4th Grade?
Add by Place Value
24 + 28 =
ADD BY PLACE VALUE The tens are added together and the ones are added together. Then the tens and ones are added together to find the total sum (answer).
24 + 28 =
Add Tens: 20 + 20 = 40
Add Ones: 4 + 8 = 12
Add Tens & Ones: 40 + 12 = 52
Add Tens Add Ones 20 + 4 20 + 8
Add Tens & Ones: 40 + 12 = 52
ADD ONE NUMBER ON OR IN PARTS
24 + 28 =
Add One Number On Using Place Value
28 + 20 = 48
48 + 4 = 52
28 48 52
Estimate to the nearest 10 to solve.
76+25=
80+30=110
What does a plant grow in math class?
What is a ...square root?
Two math books complain to each other. What do they tell each other?
I have so many problems.
Solve by decomposing.
61+19=
60+1 +10+9
60+10=70
1+9=10
70+10=80
Use a double to solve this problem.
8+7=
How would you use a double to solve this problem?
8+7=
8+8=16
16-1=15
or
7+7=14
14+1=15
In which grade level do we focus on the combinations of 5.
kindergarten
BREAK APART BY PLACE VALUE
1,234 x 9 =
Equations
Multiply Thousands: 1,000 x 9 = 9,000
Multiply Hundreds: 200 x 9 = 1,800
Multiply Tens: 30 x 9 = 270
Multiply Ones: 4 x 9 = 36
Add Products: 9,000 + 1,800 + 270 + 36 = 11,106
OR AREA MODEL
COMPENSATION
39 x 25 =
39 x 25 = (40 x 25) - (1 x 25)
39 x 25 = 1,000 - 25
39 x 25 = 975
BUILDING UP GROUPS BY MULTIPLYING
2,512 ÷ 4 =
4 x = 2,512
4 x 500 = 2,000
4 x 100 = 400
4 x 25 = 100
4 x 3 = 12
500 + 100 + 25 + 3 = 628 4 x 628 = 2,512
BREAK APART BY ADDITION
39 x 25 =
39 x 25 = (39 x 10) + (39 x 10) + (39 x 5)
39 x 10 = 390 39 x 10 = 390 39 x 5 = 195
975
Adding Up To subtracting in Parts
925 - 674 =
925 - 600 = 325
325 - 20 = 305
305 - 50 = 255
255 - 4 = 251
674 + ___ = 925
674 + 1 = 675
675 + 200 = 875
875 + 50 = 925
1 + 200 + 50 = 251
Mr. Skip had 400 dirty rags. He cleaned 379 of them. How many dirty rags are left?
What is...21
The middle name of Brad.
Bobbi
Use expanded form to solve.
355+422=
What is
300 +50+5
400+20+2
300+400=700
50+20=70
5+2=7
777
This is the grade level which contains the standard algorithm for addition and subtraction.
What is 4th Grade?
True or False. Do students need to memorize division facts?
They need to be able to relate them to multiplication.