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Lesson: Addition Strategies for Sums to 20: Doubles Minus One

In this lesson, we will learn how to use facts about doubles to add two consecutive numbers whose sum is within 20.

Worksheet: Addition Strategies for Sums to 20: Doubles Minus One • 6 Questions

Q1:

.

Q2:

.

Q3:

.

Q4:

Use

to find

Q5:

Which expression is equal to 6 + 5?

A
B
C
D
E

Q6:

Notice that 3 is one less than 4.

So the answer to is one less than the answer to .

If , which of the following is equal to ?

A
B
C

Preview

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