Question P4–P5–P6 Gap and difference
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In a garden nursery, flower pots were arranged in rows with exactly 15 pots in each row. The gardener bought 10 more pots and rearranged all the pots. There are now exactly 10 pots in each row and 8 more rows than before. How many flower pots are there in the nursery now?
Answer
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Share the same things two ways. One way leaves too many, the other too few.
In this one. The extra rows' capacity minus the pots actually added is the number of pots redistributed from the old rows.
Objects are grouped two different ways with a leftover in one arrangement and a shortage in the other, using words like 'left over' and 'short of'.
Children combine the leftover and the shortfall in the wrong direction. The gap must then be divided by the difference in group size, not by either group size.
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