Page 231 - NUMINO TG_4A

Activity 2 Divide by 2-Digit Numbers

jOb ective Divide when the divisor is a two-digit number. (2)

1. Textbook Instructions

Students will learn how to divide a 2-digit
number by a 2-digit number and a 3-digit
number by a 2-digit number when there is a
remainder. Show the students how to divide
using 62 23 as a model.

Place the first digit
62>23 so there are enough tens. Place the
first digit in the tens place.
Estimate the quotient.
600 20 3. If the quotient is 3:
23 3 69, 69>62 so it cannot be divided
by 3.
Write 2 as the quotient.
Divide the ones.
Multiply. 23 2 46
Subtract. 62 46 16
Compare. 23 16
Remainder 16
Check the answer.
23 2 16 62, it checks.

1. Have the students divide a 2-digit number by
a 2-digit number.

2. Have the students divide a 3-digit number by

a 2-digit number.

Refer to .

2. Build Understanding

Dividing a 3-digit number by a 2-digit number Divide the ones.
Divide. 147 29
Place the first digit Multiply. 29 5 145
14 29; Not enough tens to divide. Subtract. 147 145 2
147 29; Enough ones to divide. Compare. 2 29
So, place the first digit in the ones place. Remainder 2

Estimate the quotient. Check the answer.
150 30 5. If 5 is the quotient: 29 5 145. 29 5 2 147, it checks.
The dividend can be divided by 5.

214 NUMINO Teacher s Guide