Y3 and Y4 Maths Challenge.
Just 19
To complete this challenge you will need to use two rules of number: adding and taking away.
Challenge:
9, 8, 7, 2.
Using some or all of these numbers each time, can you make every number from 1 to 19 using only addition and/or subtraction? For example, 4 is made with the number sentence 9-7+2.
How did you work out your totals? Which numbers did you use first? Is there another way? What could you try next?
Post your answers to the Blog, or bring your workings out to me to stick in your Maths book.
3 comments:
9-8=1, 9-7=2, 9-8+2=3, 9-7+2=4,7-2=5,8-2=6,9-2=7,9+7-8=8,7+2=9,8+2=10,9+2=11,9+8-7+2=12,7-2+8=13,9+7-2=14,8+7=15,9+7=16,9+8=17,9+7+2=18,8+2+9=19.
Tried using simple 2 number add and take away first then looked at harder ones.
9-8=1
9-7=2
9+2=11-3=3
9-7=2+2=4
7-2=5
8-2=6
9-2=7
9+7=16-8=8
7+2=9
8+2=10
9+2=11
9+8=17-7=10+2=12
7-2=5+8=13
9-2=7+7=14
8+7=15
9+7=16
9+8=17
9+7+2=18
8+2+9=19
I tried again with the 9 8 7 2 challenge to see if I could do most of the answers different to last time. I got 5 different answers this time, my mum checked them and they were all right. Lloyd Demmer
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