Subtract by bridging a multiple of ten
Lesson 7 / 15
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I can bridge ten to subtract single digit numbers from two-digit numbers.
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When we subtract a one-digit from a two-digit number, the equation may be solved more efficiently by 'bridging ten'.
When bridging a multiple of ten, the number that is subtracted is partitioned to reach the previous multiple of ten.
Bridging ten is an efficient strategy because number pairs to ten can be used to calculate more easily.
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