Takeaway Numbers

Refer to the notes for page 6.
Encourage students to look for easy ways to subtract numbers. For example, subtracting nine is like subtracting 10 and adding one. For example:

Similarly, subtracting eight is like subtracting 10 and adding two.
As with addition facts, encourage the students to link unknown facts with those they already know. Consider 13 – 7. Ask questions like:
“Do you know 7 + = 13?”
“Do you know 14 - 7 = 7?” (using doubles)
“Look at these tens frames. Can you imagine 13 – 7?”

Students will provide a variety of answers.
Given these tens frames, most will probably imagine 13 – 7 as

Some will imagine the answer as

Answers to Activity

Answers are provided on the page as the bottom line of
the table, shown in blue.