smc-3084-10-Addition

Number and Algebra, NAP-K2-22 SA

Sanjeev collected football cards. He had collected 35 cards.

At school, Sanjeev and his friends put all their football cards together.

There was a total of 305 cards.

How many football cards, in total, had Sanjeev's friends collected?

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`270`

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`text(Cards collected by Sanjeev’s friends)`

`= 305 – 35`

`= 300 – 30`

`= 270`

Meredith made 133 cookies for two parties.

She made 13 more cookies for the party on Thursday than she did for the party on Friday.

How many cookies did she take to the party on Thursday?

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`73`

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`text(Strategy one:)`

`text(Test some educated guesses,)`

`text(If 60 made for Thursday,)`

`=>\ text{Total = 60 + 47 = 107 (too low)}`

`text(If 70 made for Thursday,)`

`=>\ text{Total = 70 + 57 = 127 (close to 133)}`

`text(If 73 made for Thursday,)`

`=>\ text{Total = 73 + 60 = 133 (correct)}`

`text{Strategy two (using algebra):}`

`text(Let)\ n =\ text(cookies made on Thursday)`

The second world war finished in 1945.

Approximately how many years ago did it finish?

`70`	`75`	`80`	`85`

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`80`

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`text(1945 plus 80 years is 2025.)`

`=>\ text(The closest approximation is 80 years.)`

An international boat show is featuring 75 cruising boats, 35 catamarans and 3 maxi-yachts.

What is the total number of boats featured at the show?

`103`	`110`	`113`	`123`

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`113`

Show Worked Solution

`75+35+3 = 113`