Add the following: a) 12 + 26 + 34 b) 51 + 10 + 26 c) 41 + 14 + 28 d) 175 + 138 Regroup and find the number: a) 2 tens + 16 ones b) 5 tens + 20 ones c) 4 tens + 32 ones d) 7 tens + 17 ones

Write down 9, carry over 1 to the tens column.

Write down 2, carry over 1 to the hundreds column.

The total is $\boxed{229}$.

2. Regroup and find the number.

a) 2 tens + 16 ones

b) 5 tens + 20 ones

c) 4 tens + 32 ones

d) 7 tens + 17 ones

3. Twenty-four children from class 2A, 18 children from class 2B, and 4 children from class 2C participated in a quiz competition. How many participants were there in the competition?

There were $\boxed{46}$ participants in the competition.

4. In a book fair, 96 people visited on the first day and 54 people visited on the second day. How many people visited the book fair in two days?

$\boxed{150}$ people visited the book fair in two days.

5. Naomi read 100 pages of a storybook in the first week and 90 pages in the second week. How many pages did she read in the two weeks?

Naomi read $\boxed{190}$ pages in the two weeks.

6. A farmer has 23 cows, 18 horses, and 14 goats. How many animals does he have?

The farmer has $\boxed{55}$ animals.

7. Add the following:

a)

The sum is $\boxed{131}$.

b)

The sum is $\boxed{179}$.

c)

The sum is $\boxed{153}$.

d) (Assuming the last number is 10)

The sum is $\boxed{175}$.

8. There are 43 students in class 1, 52 students in class 2, and 49 students in class 3. How many students are there in all the three classes?

There are $\boxed{144}$ students in all three classes.