Building Pigpens, Subtraction And Doubling Numbers Worksheets Page 7
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10Lesson 9
To double two-digit numbers, we add. Double 14.
1 4
1 4
Think! 4 + 4 = 8
+ 1 4
+ 1 4
? 8
2 8
Then think! 1 + 1 = 2
Double 14 = 28
Double each number. Try to do it in your head.
1. double 1 =
double 2 =
double 4 =
2. double 8 =
double 13 =
double 32 =
Solution
3.
“On Monday I gathered 15 eggs,” said James.
“That means that all of our chickens laid eggs on
Monday.”
“I gathered only 12 eggs on Saturday,” said
Anna, “but I gathered 15 eggs on Tuesday.”
How many eggs did the children gather on
Monday and Tuesday?
41
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