6.01 Add decimals
Are you ready?
Do you remember how to use the standard algorithm to add numbers together? Let's try this problem to practice.
Find the value of $285+113$285+113.
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You might notice that sometimes the standard algorithm is called the 'vertical algorithm'. Let's think about why. When we use the standard algorithm, we line our numbers up in 'vertical' place value columns.
Learn
This video shows us how to add numbers with decimals using the standard algorithm.
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Question 1
Find $0.15+0.61$0.15+0.61 giving your answer as a decimal.
Learn
This video shows us how to continue patterns with decimals using addition.
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Question 2
Consider the following pattern.
What is the pattern?
$0.03$0.03 $0.12$0.12 $0.21$0.21 $\editable{}$ $\editable{}$ $\editable{}$ The numbers are increasing by $9$9.
AThe numbers are increasing by $0.9$0.9.
BThe numbers are increasing by $0.09$0.09.
CThe numbers are increasing by $90$90.
DNow complete the pattern.
$0.03$0.03 $0.12$0.12 $0.21$0.21 $\editable{}$ $\editable{}$ $\editable{}$
When setting up the standard algorithm for numbers with decimals, we must line up the decimal points so that we are adding digits with the same place value.