Page 200 - NUMINO TG_3A

Activity 3 Missing Numbers 12Beat the Calculator! Unit

jOb ective Find the missing numbers.

Activity 3 Missing Numbers 1. Textbook Instructions

Have students fill in the missing numbers in the multiplication problem. Have students find the missing numbers and
understand Identity Property of Multiplication
1 . Complete the multiplication sentence by looking at Ann and Ryan’s and Zero Property of Multiplication.

conversation. 1. Have students understand that they must
calculate the ones before the tens.
24 2. Have students write the regrouped number
on top of the number where the number is
8 carried over to in small writing.
Example: 2c.
1 92
1
When 4 is multiplied The product of
by a number and 2 is 24 and 3 is a 2-digit 9
number. It cannot be 3. 8
the ones place digit, 58

the number can be
3 or 8.

2 . Find the missing numbers.

a. 8 1 b. 2 6 c. 7 9
9 2
6
2 34 1 58
486
12. Beat the Calculator! 115

2. Build Understanding

Problem: Find numbers for A and B. Solution: The product in the ones place is 2 after calculating
Use natural numbers from 1 to 9. 6 B. So, B 2 or 7.
If B 2, A 2 1 39, A 2 39 1 38,
A6 and A 38 2 19.
B But A is a 1-digit number. So B cannot be 2.
If B 7, A 7 4 39, A 7 39 4 35,
392 and A 35 7 5.
Therefore, A 5, B 7.

Answer: A 5, B 7.

3A Unit 12 183