007. Division with Remainders and Short Division
Learning Intentions
- To know that a division of two numbers can result in a quotient and a remainder, and the result can be written as a mixed numeral if there is a remainder
- use mental strategies to find quotients
- apply the short division algorithm to divide positive integers
Pre-requisite Summary
- Understanding division as sharing and grouping
- Knowledge of multiplication facts (
– times tables) - Understanding that division is the inverse of multiplication
- Ability to partition numbers into multiples of a divisor
- Understanding place value when dividing multi-digit numbers
Worked Examples
Worked Example 1
Express the result with a remainder and as a mixed numeral:
a)
b)
Worked Example 2
Use mental strategies:
a)
b)
c)
Worked Example 3
Use mental strategies with remainders:
a)
b)
Worked Example 4
Use the short division algorithm:
a)
b)
Worked Example 5
Use the short division algorithm:
a)
b)
Problems
Problem 1
a)
b)
Problem 2
a)
b)
c)
Problem 3
a)
b)
Problem 4
a)
b)
Problem 5
a)
b)
Exercises
Understanding and Fluency
-
Write with remainder and as a mixed numeral:
a)
b)
c) -
Use mental strategies:
a)
b)
c) -
Use mental strategies with remainders:
a)
b)
c) -
Use short division:
a)
b)
c) -
Use short division:
a)
b)
c) -
Divide:
a)
b)
c)
Reasoning
-
Explain why
remainder . -
A student writes
. Explain the mistake. -
How can multiplication help check
? -
Why must the remainder always be less than the divisor?
Problem-solving
-
students are placed into groups of . How many groups and how many left over? -
A teacher shares
pencils equally among classes. How many pencils per class? -
A farmer packs
eggs into cartons of . How many full cartons and how many eggs remain? -
A library divides
books equally onto shelves. How many per shelf? -
A factory produces
items and packs them into boxes of . How many boxes?
Potential Misunderstandings
- Students may write the remainder larger than the divisor
- Students may confuse the remainder with a decimal rather than a fraction
- Students may place the remainder incorrectly when writing a mixed numeral
- Students may divide each digit separately without considering place value
- Students may forget to carry the remainder to the next place value in short division
- Students may not check answers using multiplication