Add a single digit to a teen number with totals up to 20 (no help)

Add a single number to a teen with answers up to 20 with no help.

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Add a single number to a teen with answers above 20 with no help.

Add a single number to a teen with answers above 20, with the help of a number line.

Add a single number to a teen with answers up to 20, with the help of a number line.

Add a single digit to 10 with no additional help.

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