All the solutions provided in McGraw Hill My Math Grade 2 Answer Key PDF Chapter 7 Lesson 3 Mentally Subtract 10 or 100 will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 2 Answer Key Chapter 7 Lesson 3 Mentally Subtract 10 or 100
Explore and Explain
____________ students
Teacher Directions: 135 students are on the playground. 100 students go inside. How many students are left on the playground? Use base-ten blocks to solve. Write the number.
Answer:
35students are left on the playground.
Explanation:
Given,
135 students are on the playground.
100 students go inside
The difference between the given students is 135 – 100 = 35
Hence 35students are left on the playground.
See and Show
To subtract 100 or 10, think of facts you know.
Mentally subtract 100.
Subtract.
Question 1.
Answer:
229
Explanation:
The minuend is 329 and subtrahend is 100. The difference between them is 229 which is 329 – 100 = 229.
Question 2.
Answer:
810
Explanation:
The minuend is 820 and subtrahend is 10. The difference between them is 810 which is 820 – 10 = 810.
Question 3.
Answer:
263
Explanation:
The minuend is 363 and subtrahend is 100. The difference between them is 263 which is 363 – 100 = 263.
Question 4.
Answer:
668
Explanation:
The minuend is 678 and subtrahend is 10. The difference between them is 668 which is 678 – 10 = 668.
Question 5.
Answer:
714
Explanation:
The minuend is 724and subtrahend is 10. The difference between them is 714 which is 724 – 10 = 714.
Question 6.
Answer:
154
Explanation:
The minuend is 164 and subtrahend is 10. The difference between them is 154 which is 164 – 10 = 154.
Question 7.
900 – 100 = ______________
Answer:
800
Explanation:
The minuend is 900 and subtrahend is 100. The difference between them is 800 which is 900 – 100 = 800.
Question 8.
743 – 10 = _______________
Answer:
733
Explanation:
The minuend is 743 and subtrahend is 10. The difference between them is 733 which is 743 – 10 = 733.
Talk Math Tell how to mentally subtract 10 or 100.
Answer:
750 – 10 = 740
650 -100 = 550
Explanation:
Now we will subtract 10 or 100 mentally
Let us assume any number that is 750
Now subtract that number from 10
The answer is 750 – 10 = 740
let us assume another number to subtract mentally from 100.
The number is 650.
650 – 100 = 550
On My Own
Subtract.
Question 9.
Answer:
391
Explanation:
The minuend is 491 and subtrahend is 100. The difference between them is 391 which is 491 – 100 = 391.
Question 10.
Answer:
932
Explanation:
The minuend is 942 and subtrahend is 10. The difference between them is 932 which is 942 – 10 = 932.
Question 11.
Answer:
760
Explanation:
Given,
The minuend is 770 and subtrahend is 10. The difference between them is 770 which is 770 – 10 = 76033
Question 12.
Answer:
572
Explanation:
Given,
The minuend is 672 and subtrahend is 100. The difference between them is 572 which is 672 – 100 = 572.
Question 13.
Answer:
753
Explanation:
Given,
The minuend is 853 and subtrahend is 100. The difference between them is 753 which is 853 – 100 = 753.
Question 14.
Answer:
259
Explanation:
Given,
The minuend is 269 and subtrahend is 10. The difference between them is 269 which is 259 – 10 = 259.
Question 15.
Answer:
358
Explanation:
Given,
The minuend is 368 and subtrahend is 10. The difference between them is 358 which is 368 – 10 = 358.
Question 16.
Answer:
274
Explanation:
Given,
The minuend is 374 and subtrahend is 100. The difference between them is 274 which is 374 – 100 = 274.
Question 17.
Answer:
882
Explanation:
The minuend is 982 and subtrahend is 100. The difference between them is 882 which is 982 – 100 = 882.
Question 18.
498 – 100 = _____________
Answer:
398
Explanation:
Given,
The minuend is 498 and subtrahend is 100. The difference between them is 398 which is 498 – 100 = 398.
Question 19.
533 – 100 = _______________
Answer:
433
Explanation:
Given,
The minuend is 533 and subtrahend is 100. The difference between them is 433 which is 533 – 100 = 433.
Find the missing number.
Question 20.
434 – ____________ = 424
Answer:
10
Explanation:
Let’s assume the missing number is x.
Given,
434 – ____________ = 424
434 – x = 424
434 – 424 = x
x = 10
Question 21.
371 – ____________ = 271
Answer:
100
Explanation:
Let’s assume the missing number is x.
371 – x = 271
371 – 271 = x
x = 100
Question 22.
738 – ____________ = 638
Answer:
100
Explanation:
Let’s assume the missing number is x.
738 – x = 638
738 – 638 = x
100 = x
Question 23.
270 – _____________ = 260
Answer:
10
Explanation:
Let’s assume the missing number is x.
270 – x = 260
270 – 260 = x
x = 10
Problem Solving
Question 24.
863 flowers bloomed on the school playground. 100 of the flowers were eaten by bugs. How many flowers are on the playground now?
_____________ flowers
Answer:
763 flowers
Explanation:
863 flowers bloomed on the school playground
100 of the flowers were eaten by bugs
863 – 100 = 763
Therefore there are 763 flowers on the playground now.
Question 25.
299 people came to the school play. 10 people had to leave early. How many people were still at the play?
______________ people
Answer:
299 – 10 = 289 people.
Explanation:
Given,
299 people came to the school play. 10 people had to leave early
The difference is 299 – 10 = 289 people.
There are 289 people still at the play.
Question 26.
423 wildflowers grew in the field. Embry picked 10 of them. How many wildflowers are left in the field?
____________ wildflowers
Answer:
413 wildflowers.
Explanation:
Given,
There are wildflowers grew in the field = 423
Embry picked 10 of them.
To find: How many wildflowers are left in the field?
The difference between them is 423 – 10 = 413 wildflowers.
Hence there are 413 wildflowers are left in the field.
Write Math Explain how you would mentally subtract 10 from 900.
Answer:
900 – 10 = 890
Explanation:
Given,
The minuend is 900 and subtrahend is 10.
Now subtract the given numbers.
900 – 10 = 890
McGraw Hill My Math Grade 2 Chapter 7 Lesson 3 My Homework Answer Key
Practice
Subtract.
Question 1.
Answer:
377
Explanation:
The minuend is 477 and subtrahend is 100. The difference between them is 377 which is 477 – 100 = 377.
Question 2.
Answer:
368
Explanation:
The minuend is 378 and subtrahend is 10. The difference between them is 378 which is 378 – 10 = 368.
Question 3.
Answer:
779
Explanation:
The minuend is 879 and subtrahend is 100. The difference between them is 779 which is 879 – 100 = 779.
Question 4.
Answer:
235
Explanation:
The minuend is 245 and subtrahend is 10. The difference between them is 235 which is 477 – 100 = 377.
Question 5.
Answer:
749
Explanation:
The minuend is 849 and subtrahend is 100. The difference between them is 849 which is 849 – 100 = 749.
Question 6.
Answer:
310
Explanation:
The minuend is 320 and subtrahend is 10. The difference between them is 310 which is 320 – 10 = 310.
Find the missing numbers.
Question 7.
358 – ___________ = 258
Answer:
Let’s assume the missing number is x.
Given
358 – x = 258
358 – 258 = x
The difference between the two numbers is 100
The missing number is 100.
Question 8.
843 – ____________ = 833
Answer:
Let’s assume the missing number is x.
843 – x = 833
843 – 833 = x
x = 10
The missing number is 10.
Question 9.
954 – _____________ = 944
Answer:
Let’s assume the missing number is x.
Given,
954 – x = 944
954 – 944 = x
x = 10
The missing number is 10.
Question 10.
700 – _____________ = 600
Answer:
Let’s assume the missing number is x.
Given,
700 – x = 600
700 – 600 = x
x = 100
The missing number is 100.
Question 11.
Joan counts 143 birds by the pond. 100 birds fly away. How many birds are left by the pond?
____________ birds
Answer:
43 birds are left by the pond.
Explanation:
Given,
there are 143 birds by the pond.
100 birds fly away
The difference between 143 -100 = 43 birds
Hence there are 43 birds are left by the pond.
Question 12.
There were 694 tadpoles in the lake. 100 of the tadpoles turned into frogs. How many tadpoles were left in the lake?
______________ tadpoles
Answer:
694 – 100 = 594 tadpoles.
Explanation:
Given,
There were 694 tadpoles in the lake.
100 of the tadpoles turned into frogs.
To find: How many tadpoles were left in the lake
The difference between 694 – 100 is 594 tadpoles.
Test Practice
Question 13.
Find 363 – 100
(A) 163
(B) 263
(C) 363
(D) 463
Answer:
263
Explanation:
The minuend is 363 and subtrahend is 100. The difference between them is 263 which is 363 – 100 = 263.
Math at Home Practice saying a number and having your child subtract 10 or 100 from the number mentally.
Answer:
Let the number be 253
Now subtract 100 from the given number 253
253 – 100 = 243
Let another number be 63.
Now subtract 10 from the given number 63
63 – 10 = 53