3-3 Partial-Sums Addition

3-3 Partial-Sums Addition

Multiple Choice

What would be an estimate with close-but-reasonable number for 44+77=?

• 40+70=110

• 40+80=120

• 50+70=120

• 50+80=130

Multiple Choice

What would be a close-but-reasonable estimate for 58+96=?

• 60+90=150

• 50+90=140

• 50+100=150

• 60+100=160

145+322

Write in vertical form on your whiteboard.

What is expanded form?

Is 467 reasonable?

If you add close-but-reasonable numbers 150+300=450. 467 is only 17 away from 450. If I rounded to the nearest 100 and got 400, that is about 65 from the actual answer.

Solve 269+475 using partial sums