What is mental math?
Mental math means doing math in your head without using pencil or paper.
What is a number that is greater than 200 but less than 600?
Answers vary
Which place value do we start adding at?
Ones
Solve 902 + 10 =
912
What is your favorite strategy to solve an addition number sentence?
Answers vary
True or False: 754 < 800
True.
Solve.
866
What number is this?
683
Solve 230 + 100 =
330
30 second dance party! Go!
DANCEEE!
What number is being represented by the base ten blocks?
402
What are models?
Models are a drawings that represent numbers.
How is an open number line different from a regular number line?
An open number line does not have any numbers on it. You can write your own numbers on it to help you solve equations.
Solve.
843
What number is being represented by the base ten blocks?
358
20 Second dance party! GO!
DANCE!
Solve 456 + 100 =
556
What do we call when we make a group of ten to make it easier to add or subtract?
Regrouping
Solve 758 + 10 =
760
True or False: 491 > 490
True.
Solve.
918
Count by 100 to 1000.
100 200 300 400 500 600 700 800 900 1000
How do you write 958 in expanded form?
900 + 50 + 8 = 958
Lyric has 34 Sour Straws. Meggie has 50 Sour Straws. How many Sour Straws do they have altogether?
84