When you know the doubles you can use them for so many things. Practice your doubles by singing along with yourselves! You could write out the words for yourself - they go like this 1+1=2, 2+2=4, 3+3=6 and 4+4=8 5+5=10, 6+6=12, 7+7=14, 8+8=16, 9+9=18 AND 10+10=20!
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