Page 181 - NUMINO TG_3A

Activity 1 Multiplication with Regrouping Twice

jOb ective Multiply a 2-digit number by a 1-digit number.

1. Textbook Instructions Activity 1 Multiplication with Regrouping Twice

Explain to students how to multiply a 2-digit 1 . Use models to find the product.
number by a 1-digit number with two
regroupings.

1. Have students calculate the ones before Multiply the ones. 1 34 Multiply the ones.
the tens when multiplying a 2-digit number by 3 ^ 4 ones 12 ones 3 Multiply the tens.
a 1-digit number. Then, have them add up the 3 ^ 4 ones 1 ten 2 ones 34 Add the products.
numbers to find the product. ^3 12
Multiply the tens. 90
3 ^ 3 tens 9 tens 2 102

You can also explain it in the following way. Add all the tens. 1
9 tens 1 ten 10 tens
Example: 34 9 tens 1 ten 1 hundred 34
^3

102

3

12 3 4

9 0 3 30

102

Have students who are having difficulty to a. b. 4 7
15 ^2
multiply the numbers use a model to
^6 94
calculate.
90

Refer to .

c. d.
39 26

^3 ^4

117 104

102

2. Build Understanding

Example: 1b. Multiply the ones. Multiply the tens.
47
2 1 1

164 NUMINO Teacher s Guide 47 47
2 2
4
94
Regroup the ones.
14 ones = 1 ten and 4 Add the tens and the regrouped
ones. ones. Then, add the ones you
added.