Dividing a number to 100 with remainder

Students learn to divide a number to 100 with remainder.

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The students learn to divide a number to 100 with remainder.

CCSS.Math.Content.4.NBT.B.6

Students will be able to divide numbers to 100 with remainder.

Have the students solve the problems with division tables with remainder.

Explain that with division problems with a number to 100 with remainder you first see what number you can combine with the divisor that is closest below the dividend. For the problem 81 ÷ 7 you look for the largest number you can take away. 10 × 7 = 70. Subtract the 70 from the 81. You still have 11 left over. Now you subtract 1× 7 = 7 from the 11. 11 - 7 = 4. You can no longer divide 4 by 7. So 4 is your remainder. Now you add the outcomes together and include the remainder in your answer: 10 + 1 = 11 R 4. Have the students solve the division problems on their own. Next show the problem 104 ÷ 19. In this problem, start again by seeing what the largest number is that you can take away from the dividend. To see this more easily, you can make a helping line. The largest number you can take away is 5 × 19 = 95 . 104 - 95 = 9. You can't divide 9 any more by 19, so that is your remainder. The outcome is then 5 R 4. Have the students solve the next division problems on their own. Next, walk through the steps of solving a story problem with the students. Have the students solve the next two story problems on their own.

Check whether the students understand dividing a number to 100 with remainder by asking the following question:

- What steps do you follow to solve the problem 49 ÷ 3?

The students test their understanding of dividing a number to 100 with remainder through completing ten exercises. Some of the exercises are abstract division problems, and others are story problems.

Discuss once again the importance of being able to divide a number to 100 with remainder. As a closing activity you have the students determine if the story problem is true or false. They can do this by standing if they think that the story is true, and staying seated if they think the answer is false.

Have students that have difficulty with dividing a number to 100 with remainder, first practice with the division tables and dividing to 100 without remainder.

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