Multiplying by twos fives and tens: by Harley

Learning-Intention-W.A.L.T - multiply numbers up to 100.
Success Criteria: I know I am successful when I can multiply numbers using skip counting, doubles and repeated addition.
Problems:How many marbles are there altogether?

1) 2 children had 10 marbles each=20
I know its 20 because I Skip count by twos; 2,4,6,8,10,12,14,16,18,20 and I use doubles;
10+10=20 or 10x2=20.



2) Poppy,Sam and Mille have 5 marbles each.
How many marbles do they have altogether.=15
I know it's 15 because I use repeated addition 5+5+=15
and I multiplied by 5x3=15.

3)  Bentley eat 3 packets biscuits, and there are ten biscuit in each packets. How many biscuits all together?=30
I know its 30 because I used repeated addition 10+10+10=30; I multiplied 3x10=30; I skip count by ten =10,20,30.