How can you subtract two integers without number lines or counters
1 answer:
For example:
12 - 10 = ?
Start with the numbers to the far right; take your 2 from the 12 draw a curving line from that 2 to the 0 in 10; ask what is 2 minus zero? 2!
Draw a curving arrow from the 1 in 12 to the 1 in 10. And ask, what is one minus one ?
Zero.
Try that with other numbers
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