Divide by 8

Learning Objectives Relate division by 8 to its inverse operation, multiplication by 8. Use the strategy of repeated subtraction to solve division problems with a divisor of 8. Model division by 8 by drawing or using objects to create equal groups. Solve one-step word problems that require dividing by 8. Recall the division facts for the number 8 with increasing fluency. Use a multiplication fact table or number line to find the quotient in a division by 8 problem. If an octopus has 8 arms, and you see 24 arms waving at you, how many octopuses are there? 🐙 In this lesson, we will learn all about dividing by 8! This means we will practice sharing a total amount into 8 equal groups. Learning to divide by 8 helps us solve problems quickly and is a key step in becoming a math...

TermDefinitionExample DivisionThe process of splitting a number into equal parts or groups. It's like fair sharing.24 ÷ 8 means splitting 24 into 8 equal groups. DividendThe total number that you are dividing. It's the big number you start with.In 40 ÷ 8 = 5, the dividend is 40. DivisorThe number that you are dividing by. It tells you how many groups to make.In 40 ÷ 8 = 5, the divisor is 8. QuotientThe answer to a division problem. It tells you how many are in each group.In 40 ÷ 8 = 5, the quotient is 5. Fact FamilyA set of four related math facts that use the same three numbers. It includes two multiplication and two division facts.The fact family for 6, 8, and 48 is: 6 × 8 = 48, 8 × 6 = 48, 48 ÷ 8 = 6, 48 ÷ 6 = 8. Equal GroupsGroups that all have the exact same number of items...

Inverse Operation Rule a \div 8 = b \quad \text{is the same as} \quad b \times 8 = a Division and multiplication are opposites. If you are stuck on a division problem like 32 ÷ 8, you can think, 'What number times 8 equals 32?' Halving Thrice Rule x \div 8 = (x \div 2) \div 2 \div 2 This is a cool trick! Dividing a number by 8 is the same as cutting it in half three times. For 40 ÷ 8, you can do 40 ÷ 2 = 20, then 20 ÷ 2 = 10, then 10 ÷ 2 = 5. Division by Itself Rule 8 \div 8 = 1 Any number (except zero) divided by itself is always 1. If you have 8 cookies and 8 friends, each friend gets 1 cookie.