Number (add/sub)
Lesson
Adding 3 numbers at a time might look tricky, but you can use the same strategies used for adding 2 numbers to help you.
Have a look at the video below. Watch how the strategies of using a number line and compensation were applied.
One strategy was not mentioned - bridge to 10. You can also apply bridge to 10 with 3 numbers. What do you think that might look like?
Worked Examples
question 1
Evaluate $41+7+1$41+7+1
question 2
Evaluate $3+42+4$3+42+4
Question 3
A bakery sells $105$105 cakes, $60$60 bread rolls and $50$50 muffins in the morning.
What is the total number of items the bakery sells in the morning?
$155$155
A$110$110
B$215$215
C$205$205
D