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Bar models can be a great help when adding mentally. Children may also want to make jottings when doing these.
Using the vocabulary of addition: adding a 2-digit number to a single digit with totals up to 20. Bar models are used to illustrate the sum.
Add three small numbers.
Add three small numbers with pictures.
Use knowledge of numbers that add up to 10 to add 3 numbers.
Use knowledge of numbers that add up to 10 to add 3 numbers
Adding a number to make a total of 20.
Adding a 2-digit number to a single digit with totals up to 20.
Using a number line to help with adding multiples of 100.
Use a number line to help add numbers up to a total of 20.
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