Tips For Doing Long Division

To view timestamps in the description (answers each question) click "copy link" on the video, then paste it in a separate browser tab.

Question 1: Using the “DiM SuB” method, do we subtract immediately before multiplying?

• No

• Yes

Answer explanation

No. M is for multiply, S is for subtract. We multiply then we subtract.

Tags

CCSS.6.EE.A.3

CCSS.6.NS.B.3

Can we avoid some multiplication and division errors by writing out a times table?

• No

• Yes

Answer explanation

Yes. This may also save you time overall.

Tags

CCSS.3.OA.C.7

CCSS.3.OA.D.9

For all multiplication problems, can we switch the order of the factors and still get the right answer?

• No

• Yes

Answer explanation

Yes. For example, the factor 1 and the factor 8 can be switched: 1 x 8 = 8, and 8 x 1 = 8.

Tags

CCSS.3.OA.B.5

Can we find the difference between two numbers by counting forwards?

• No

• Yes

Answer explanation

Yes. Start with the smaller number and count the steps until you reach the bigger number.

Tags

CCSS.3.NBT.A.2

Is the dividend the number that does the dividing?

• No

• Yes

Answer explanation

No. The dividend is divided, the divisor does the dividing.

Tags

CCSS.3.OA.A.2

Is the divisor the number that gets divided?

• No

• Yes

Answer explanation

No. The dividend is divided, the divisor does the dividing.

Tags

CCSS.3.OA.A.2

Can we express a remainder as a decimal?

• No

• Yes

Answer explanation

Yes. In this example in which we were dividing by 8, we changed a remainder of 1 to 0.125.

Tags

CCSS.6.NS.C.6

When we add a decimal point to the right of a number, can we then add many zeros to the right of that decimal point?

• No

• Yes

Answer explanation

Yes. We have to do this when doing long division to make an answer with a decimal.

Tags

CCSS.5.NBT.A.2