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How can we multiply 13 times 5

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Even for larger numbers, it's still equal to 13 groups with each group having 5 items in it

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But let's look at the 13 groups as being 10 groups of 5 items, and then another 3 groups of 5 items

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For the 3 groups, we can add them up individually and see that 3 groups of 5 is 15.

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Notice that we're skip counting by 5s, so let's try that 10 times to see what 10 groups of 5 is. We can see that it's 50

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So ten groups of 5 is 50, and 3 groups of 5 is 15. We need both of those for our answer.

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So we can add them together. 50 plus 15 is 65

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Which means that 13 times 5 is equal to 65.