Page 167 - NUMINO TG_3A
P. 167
Activity 2 Regrouping in Tens Place
jOb ective Learn how to multiply a 2-digit number by a 1-digit number with a regrouping in the tens place.
1. Textbook Instructions Activity 2 Regrouping in Tens Place
Explain how to calculate (2-digit number) (1- 1 . The 3rd grade students in Ricky ’s school are going on a field trip.
digit number) with a regrouping in the tens
place. Students are on 3 buses that carry 42 students each.
1. This is an exercise where students have to How many students are going on the field trip?
try to find out how to calculate the problems.
There are 42 students on each bus. How There are 126 students going on the field trip.
many buses are there? 3 buses.
How can you find the total number of Discuss how you can check your answer.
students on all 3 buses?
A1: There are 42 students on each of the If there are 3 buses with 42 students on each bus, you can multiply 3 by 42 to get 126.
3 buses.
42 42 42 126
A2: Use what you have learned earlier to
multiply 3 42.
94
2. Build Understanding
For students who are having difficulty solving Problem 1, use model blocks to explain how to solve the
problem.
There are 42 students on each of the 3 buses. You can use the model blocks below to show this.
42 42 42 126
149 NUMINO Teacher s Guide
jOb ective Learn how to multiply a 2-digit number by a 1-digit number with a regrouping in the tens place.
1. Textbook Instructions Activity 2 Regrouping in Tens Place
Explain how to calculate (2-digit number) (1- 1 . The 3rd grade students in Ricky ’s school are going on a field trip.
digit number) with a regrouping in the tens
place. Students are on 3 buses that carry 42 students each.
1. This is an exercise where students have to How many students are going on the field trip?
try to find out how to calculate the problems.
There are 42 students on each bus. How There are 126 students going on the field trip.
many buses are there? 3 buses.
How can you find the total number of Discuss how you can check your answer.
students on all 3 buses?
A1: There are 42 students on each of the If there are 3 buses with 42 students on each bus, you can multiply 3 by 42 to get 126.
3 buses.
42 42 42 126
A2: Use what you have learned earlier to
multiply 3 42.
94
2. Build Understanding
For students who are having difficulty solving Problem 1, use model blocks to explain how to solve the
problem.
There are 42 students on each of the 3 buses. You can use the model blocks below to show this.
42 42 42 126
149 NUMINO Teacher s Guide
