mr barton maths

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Decimal Addition

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Foundational skills
Add tenths mentally
\[ 0.3 + 0.5 = \square \]
Add two tenths with no carrying.
Add tenths with carrying to ones
\[ 0.7 + 0.6 = \square \]
Add two tenths where sum exceeds 1.
Add hundredths mentally
\[ 0.04 + 0.03 = \square \]
Add two hundredths with no carrying.
Identify which column to add first
\[ 3.47 + 2.81 \]
Which column do you add first?
Adding decimals (same decimal places)
Add two 1dp decimals (no carrying)
\[ 2.3 + 4.5 = \square \]
No carrying required.
Add two 1dp decimals (carrying from tenths)
\[ 3.7 + 2.8 = \square \]
Carrying from tenths to ones.
Add two 1dp decimals (carrying from ones)
\[ 8.4 + 6.3 = \square \]
Carrying from ones to tens.
Add two 2dp decimals (no carrying)
\[ 1.23 + 3.45 = \square \]
Two decimal places, no carrying.
Add two 2dp decimals (carrying from hundredths)
\[ 2.47 + 3.28 = \square \]
Carrying from hundredths to tenths.
Add two 2dp decimals (multiple carries)
\[ 4.78 + 3.65 = \square \]
Carrying in multiple columns.
Add two 3dp decimals
\[ 1.234 + 2.345 = \square \]
Three decimal places.
Adding decimals (different decimal places)
Add 1dp and 2dp decimals
\[ 3.4 + 2.15 = \square \]
Different decimal places.
Add 1dp and 3dp decimals
\[ 5.6 + 1.234 = \square \]
1dp + 3dp decimals.
Add 2dp and 3dp decimals
\[ 4.75 + 2.125 = \square \]
2dp + 3dp decimals.
Adding decimals with whole numbers
Add whole number to 1dp decimal
\[ 7 + 3.4 = \square \]
Whole number plus 1dp decimal.
Add whole number to 2dp decimal
\[ 5 + 2.75 = \square \]
Whole number plus 2dp decimal.
Add 1dp decimal to whole number (carrying)
\[ 4.8 + 7 = \square \]
Result crosses into next ten.
Adding multiple decimals
Add three 1dp decimals
\[ 2.3 + 1.5 + 3.1 = \square \]
Add three 1dp numbers.
Add three 2dp decimals
\[ 1.25 + 2.50 + 0.75 = \square \]
Add three 2dp numbers.
Column method
Set up column addition with decimals
\[ 3.4 + 12.567 \]
Align decimals correctly in columns.
Complete column addition (2dp)
\[ 5.67 + 2.48 = \square \]
Column method with 2dp.
Complete column addition (different dp)
\[ 7.3 + 2.85 = \square \]
Column method, different dp.
Complete column addition (3 numbers)
\[ 2.34 + 5.12 + 1.43 \]
Column method with 3 numbers.
Complements to 1
Complement to 1 with 1dp
\[ 0.3 + \square = 1 \]
Find complement to make 1.
Complement to 1 with 2dp
\[ 0.35 + \square = 1 \]
Find complement to make 1.
Complement to 1 with 3dp
\[ 0.125 + \square = 1 \]
Find complement to make 1.
Find the missing addend to 1 (mixed)
\[ \square + 0.6 = 1 \]
Gap on the left side.
Adding to next whole number
Add to reach next whole number (1dp)
\[ 2.7 + \square = 3 \]
Find what reaches next whole.
Add to reach next whole number (2dp)
\[ 5.45 + \square = 6 \]
Find what reaches next whole.
Special cases
Add decimals that sum to a whole number
\[ 3.6 + 2.4 = \square \]
Answer is a whole number.
Add decimals with zeros
\[ 3.05 + 2.4 = \square \]
Decimals containing zeros.
Add to make a whole number
\[ 4.3 + \square = 8 \]
Target is a whole number.
Add small decimals (less than 1)
\[ 0.45 + 0.38 = \square \]
Both decimals less than 1.
Timer (Optional)
Question