2nd Grade - Math

LESSON PROBLEM: Computation: You have five rice cookies. You got a package of 12 cookies. How many cookies do you have altogether?


STUDY GUIDE


To be able to add "in your head" is very helpful and fast. It is quicker than a calculator. If you have not learned how, do not worry. Keep practicing and you will soon be able to add all of the addition facts up to 20.

You have 5 quarters left from last month's allowance. You have 8 more quarters from this month's allowance. You want to spend it on rice treats. How much money do you have for the rice treats?

It does not matter which direction you use in order to add. To add 5 and 8, start counting from 8. Count only 5 more numbers. It is quick and easy. Count 9, 10, 11, 12, 13. The answer is 13.

If you had started counting from 5 and counted 8 numbers beyond, the answer would still have been the same. Start counting: 6, 7, 8, 9, 10, 11, 12, 13. Again the answer is 13.

When you want to add two different numbers, take the shorter route. Add the smaller number to the larger one.

Use the table to do the examples that follow. Learn the table. It is easy to remember the sums to 20.

+ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
2 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
3 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
4 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
5 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
6 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
7 7 8 9 10 11 12 13 14 15 16 17 18 19 20
8 8 9 10 11 12 13 14 15 16 17 18 19 20
9 9 10 11 12 13 14 15 16 17 18 19 20
10 10 11 12 13 14 15 16 17 18 19 20
11 11 12 13 14 15 16 17 18 19 20
12 12 13 14 15 16 17 18 19 20
13 13 14 15 16 17 18 19 20
14 14 15 16 17 18 19 20
15 15 16 17 18 19 20
16 16 17 18 19 20
17 17 18 19 20
18 18 19 20
19 19 20
20 20

In the table above, find the 5 in the first row and the 8 in the first column. If you move to the right of 8 and down from 5, you will come to a square where the two meet. This square has the number 13, which is the sum of 5 and 8.

Here's another example. You are inviting 9 cousins and 11 friends to a rice party. You want to find out how many rice snacks you will need to buy so that each one gets a snack. Add 9 and 11. Using the table, move down from 9 and right from 11. The row and the column meet at 20. So 20 is the answer.

Now take 11 in the first row and 9 in the first column. Move down from 11 and go right from 9. Again the two meet at 20.

Use the table to answer the following.

In a rice cooking contest, there are 12 entries for rice pudding and 7 for fried rice. How many total entries are there?
At a picnic there are 5 servings of rice noodles and 9 servings of rice salad. How many total servings of rice dishes are there?
At a rice snack fair, Jimmy purchased 9 sweet and 7 salty snacks. Find the total number of rice snacks that he purchased.
Susan's father, a Missouri rice farmer, planted long grain rice on 14 acres and short grain rice on 5 acres. On how many acres did he plant rice?
Janet purchased 9 pounds of white rice from one store and 5 pounds of brown rice from another store. What is the total amount of rice she purchased?
Peter worked on one Texas rice farm for 9 days and on another for 7 days. Find the total number of days that he worked on rice farms.
Now practice some more addition facts.





ACTIVITIES

Sit with a friend or somebody from your family. Have some rice cereal handy. Now call out a number and ask your friend to do the same. Find the total of the two numbers.

Pretend you said 7 and your friend said 9. Add the two numbers (the numbers 7 and 9). When you have your answer put the right amount of rice cereal on the table. Ask your friend to do the same. Count the cereal. The total amount of cereal grains gives you the answer.

Continue with the game and have fun. For more practice, try making a worksheet.





EXTENDED LEARNING

You are told to add two numbers, such as 15 and 7. Without the help of any objects, how would you do it? Illustrate your answer.




VOCABULARY
  • add
  • plus
  • altogether
  • total
  • count
  • forward
  • column
  • row
  • allowance
  • calculator


Click here to play Rice Rampage!
Rice Farm Animals:
Rice farms have lots of animals. Click here to learn more about rice farms and the animals that live there.
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