Page 185 - NUMINO TG_3A

Activity 3 Multiply 3-Digit Numbers

jOb ective Multiply a 3-digit number by a 1-digit number.

1. Textbook Instructions Activity 3 Multiplying 3-Digit Numbers

Explain to students how to multiply a 3-digit Follow the instructions to multiply.
number by a 1-digit number using regrouping.
1 11 11
Have students calculate the ones, tens, and
then the hundreds. Have them write the 367 367 367
regrouped ones on the top of the tens, and ^2 ^2 ^2
the regrouped tens on the top of the
hundreds in small writing. 4 34 734

1. Have students write the regrouped Multiply the ones. Multiply the tens. Multiply the hundreds.
number inside the small box, so they don’t 2 ^ 7 ones 2 ^ 6 tens 12 tens 2 ^ 3 hundreds
forget the number that has been carried 14 ones 6 hundreds
over. 14 ones 1 ten Add all the tens.
4 ones 12 tens 1 ten Add all the hundreds.
13 tens 6 hundreds
13 tens 1 hundred 1 hundred
3 tens 7 hundreds

1 . Fill in the blanks. b. 1 c. 2
463 215
a.
121 ^2 ^4

^4 926 860

484

d. 2 e. 1 2 f. 2 1
507 237 473

^4 ^3 ^4

2,028 711 1,892

106

2. Build Understanding

For students who are having difficulty solving the problems, explain how to multiply a 3-digit number by a 1-
digit number, as shown below.

Multiply the ones. Multiply the tens. Multiply the hundreds and then add the

367 27 367 27 numbers to find the product.
2 2 2 60 367
2
14 14 14 2 7
120 1 2 0 2 60
6 0 0 2 300
734

168 NUMINO Teacher s Guide