Page 232 - NUMINO TG_4A

15Whose Equation Is Correct? Unit

Have the students divide problems whose
quotients are 2-digit numbers.

Place the first digit
32 41; Enough tens to divide.
So, place the first digit in the tens place.
Divide the tens
40 30 10. If the quotient is 1: 32 1 32.
1 can be the quotient.
Divide. 41 32
Multiply. 32 1 32
Subtract. 41 32 9
Compare. 9 32
Divide the ones.
Divide. 95 32
90 30 3. If the quotient is 3: 32 3 96.
96 is larger than 95, so the 3 does not work.
Use 2 as the quotient.
Multiply. 32 2 64
Subtract. 95 64 31
Compare. 31 32
Remainder 31
Check the answer.
32 12 31 415, it checks.

3. Have the students use the method shown
above to complete the division problems and
checks.

Problem:
228 books need to be placed in boxes that hold 25 books each. If all the books need to be packed, at least
how many boxes are needed? Write the solution and answer.
Answer:
228 25 9 r3. If there are 9 boxes, then 3 books will remain.
1 more box is needed for the remaining 3 books.
Number of boxes needed 9 1=10 boxes.

4A Unit 15 215