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Opens on Chapter 5’s example: 368 + 257 as partial sums and in columns, and 403 − 158 across a zero.
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From the book, Chapter 5. 368 + 257: hundreds 500, tens 110, ones 15, so 625. In columns, 8 + 7 = 15 ones is 1 ten and 5 ones: that 1 is the carry. For 403 − 158 the 4 hundreds become 3 hundreds, 9 tens and 10 ones before anything is taken away; check by adding 245 + 158.
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