Grade 3Math
Combining Tables into OnePut monthly tables together, and read them across and down
We put 3 tables, for April, May, and June, together into 1 table. Reading across shows how the numbers change from month to month, and reading down shows the differences between kinds in the same month. We also use the total row and column to check that the numbers add up.
The narration and the pictures are in Japanese. You can hear the same words that are used in class at a Japanese school.
- Video
- 1:48（7 scenes）
- Problems
- 3 problems
Open this lesson in Japanese（表を 一つに まとめる）
Let's try
Write the math sentence in your notebook first, then open the answer.
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1We put the favorite sports of Class 1 and Class 2 into a table. Soccer: Class 1 9 people, Class 2 7 people. Swimming: 6 people and 8 people. Jump rope: 5 people and 6 people. Is the most popular sport in Class 2 alone the same as the most popular sport for Class 1 and Class 2 together?
Hint
Look at the Class 2 column going down and the total column at the right end separately. You get the totals by adding across.
Answer
No, they are different. Looking down the Class 2 column, swimming has the most people, with 8. Adding across to get the totals: soccer 9 + 7 = 16, swimming 6 + 8 = 14, jump rope 5 + 6 = 11. Together, soccer has the most people, with 16.
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2In the book table, month 5 had 9 stories, 4 picture encyclopedias, 2 science books, and 4 other books. How many books were borrowed in all in month 5? Which box in the table tells you?
Hint
The total for each month is the number you get by adding down.
Answer
19 books. 9 + 4 + 2 + 4 = 19. Look at the total box at the very bottom of the month 5 column.
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3In the book table, picture encyclopedias were 5 books in month 4, 4 books in month 5, and 6 books in month 6. How many picture encyclopedias in all for the 3 months? What is the difference from the total for stories, 25 books?
Hint
The total for each kind is the number you get by adding across. Look at the column at the right end of the table.
Answer
The total for picture encyclopedias is 15 books (5 + 4 + 6 = 15). The difference from stories is 25 − 15 = 10, so it is 10 books.
Words in this lesson
- total 合計
- The number you get by adding everything. It is written in the column at the right end or the row at the bottom of a table.
- box (cell) ます
- A square in a table where you write a number. It is where a column going down and a row going across meet.
- combining tables 表を まとめる
- Putting several tables that looked into the same thing together into 1 table.
For parents and guardians
- The names of lessons and the order of topics differ slightly between textbooks. This page follows the content of Japan's national curriculum guidelines (the Course of Study).
- In 3rd grade, children combine several tables, each made from one point of view such as by month or by class, into one table and read it. Reading the combined table across shows how things change from month to month, and reading down shows which is more or less within the same month. Please check together whether your child can say in words what the column totals and the row totals each stand for.
- The bottom right box gives the same number whether you add the totals on the right or the totals at the bottom. If they don't match, there is a counting or adding mistake somewhere. The habit of using the total boxes to check is also useful for tables with two points of view in 4th grade.