Welcome to the Maths blog for 2017. Our teacher is Mrs Madden. We are looking forward to working together and learning new mathematical concepts and accelerate our learning.
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I learnt to double ie 19+19=38 I first got 19 blocks and then added 19 more. Then I learnt another way: 20 + 20 = 40 40 - 2 = 38 (We add to add 1 more to make 19 two times, so need to take 2 away).
I learnt to double ie 19+19=38
ReplyDeleteI first got 19 blocks and then added 19 more.
Then I learnt another way:
20 + 20 = 40
40 - 2 = 38 (We add to add 1 more to make 19 two times, so need to take 2 away).
My strategy for 19 + 19 = ?
ReplyDelete20 + 20 = 40
40 - 2 = 38
If we don't take away 2 it will be 40 not 38.
We have to add 1 more to make 20. Because 19 + 1 = 20.
I learnt to use my tens for counting. For an example: 10 + 10 = ? easy way. 10 20 it = 20. hard way. 12345678910/11 12 13 14 15 16 17 18 19 20 it= 20
ReplyDelete