Algebraic thinking
Operations
Measurement
100
What do these numbers have in common?

27 and 123

They have the same tens. They both have 2 tens.

100

What is the answer?

45 - 23 = ?

22

100

Give an example of a digit number

0, 1, 2,...,9

200

What number comes next?

12 - 22 - 32 - ?

42

200
Teacher Minh has 9 students in Grade 1, 12 students in Kindergarten, 6 students in Grade 2, and 7 students in Grade 3. How many students does he work with in SBS Lower school?

34

200

How many digits in two hundred twenty-three

3 digits

300

Quick math!  49 - 27 = 22.

What is result of this equation

50 - 27 = ?

23

300

Teacher Minh worked with 42 students at the beginning of the year. 8 students withdraw from Catapult. How many students does he work with now?

34

300

What is a digit number?

a numeral from 0 to 9

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