Estimate by Rounding to the Nearest ten or hundred
71-45=
70-50=20
Solve using partial difference
Find 440-202=
440-200=240
240-0=240
240-2=238
Align and Subtract
300-107=
300-107=193
192 students play basketball. 207 students play Soccer. 238 students play baseball. How many more students play baseball than basektball?
46 more students
439-149=
Estimate by rounding to the nearest hundred
400-100=300
Align and Estimate to the nearest ten
85-54=
90-50=40
Solve using partial difference
658-467=
658-400=258
258-60=198
198-7=191
find the difference and check
544-393=
151
151+393=544
Jenna is going to find 543-258. Before she subtracts Jenna knows she will need to regroup. How does she know that? What is her answer?
She knows because 8 ones is greater than 3 ones. 5 tens is greater than 4 tens. Her answer will be 285
Add or subtract to find the missing numbers
683-141= l_l l_l l_l
l_l l_l l_l +141= 683
542: 542
Align and Estimate to the nearest hundred
654-382=
700-400=300
Use partial difference to find the answer
805-698=
805-600=205
205-90=115
115-8=107
find the difference and check
422-319=
103
103+319=422
In one month 785 cars and 597 trucks were washed at a car wash. How many more cars were washed than trucks?
188 cars
Regroup and subtract
900-736=
164
Align and Estimate to the nearest ten and hundred
870-129=
NEAREST TEN
870-130=740
NEAREST HUNDRED
900-100=800
The soccer team collects 748 cans for the food drive. The baseball team collects 572 cans for the food drive. Using partial difference tell me how many more cans the soccer team collected.
748-500=248
248-70=178
178-2=176 more cans
Regroup and subtract
850-453=
850-453=397
A year has 365 days. It rained 64 days during the year. It snowed 45 days during the year. How many days of the year did not have rain or snow?
256 days
Write a problem that can be shown by the bar model. Solve the problem
l____ 672 ____l
l_451__l__?___l
Answers can be different this is an example
A school has 672 pencils to give to students. The school gave 451 pencils aways. How many pencils are left? 221 pencils are left
Jada needs to estimate the difference 541-119. She can estimate by rounding to the nearest ten or hundred. Which will give her an answer that is closest to the actual difference? Explain!!!!!
Nearest Ten
540-120=420
Nearest Hundred
500-100=400
Actual difference
422
Rounding to the Nearest Ten puts me at a closer estimate to the actual sum.
Ellie Collects coins as a hobby. She has 327 pennies and 184 nickles. Ellie wants to know how many more pennies she has than nickles. She subtracts 327-184 using partial differences.
327-100=227
227-80=147
147-4=143
A ferry can hold up to 400 cars. So far 167 cars have already been loaded onto the ferry. How many more cars will the ferry hold? Write and equation and solve the problem.
400-167= 233 more cars
A coffee shop bought a box of 325 cups. It has used 112 cups. How many cups are left? Show how you can subtract and then check by using addition.
325-112=213 cups
213+112=325 cups
Maria found 714+242= 956. How many equations can Maria write to check her answer? What are they?
956-242=714
956-714=242
242+714=956