since the question did not state that the cards are to be arranged without overlapping and with no gap, then min number is 4 cards as follows:tracywham wrote:speedmaths.com wrote:Hi tracywham,tracywham wrote:Another question:

Mufaddal wants to make a square by piecing rectangular cards together, each measuring 7 cm by 5 cm. What is the least number of cards he needs to make a square?

The smallest square should be a 35 cm by 35 cm square.

(Lay out the cards in 5 columns and 7 rows)

So he needs 5 x 7 =35 cards.

Hope this helps.

Cheers

speedmaths

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Hi. I got the same answer. But the teacher gave the answer as 6 cards.

cheers.