# McGraw Hill My Math Grade 3 Chapter 3 Lesson 7 Answer Key Subtract Across Zeros

All the solutions provided in McGraw Hill Math Grade 3 Answer Key PDF Chapter 3 Lesson 7 Subtract Across Zeros will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 3 Answer Key Chapter 3 Lesson 7 Subtract Across Zeros

Example 1
A large box of watermelons weighs 300 pounds. A smaller box weighs 134 pounds. What is the difference in the weight of the two boxes?
Find the unknown. 300 – 134 =

2. Regroup once more. Then subtract by placing an X on the blocks.

Check Use ___ to check.

So, 300 – 134 = 166 pounds. The unknown is 166

Use what you have learned about regrouping two times to regroup three times.

Example 2
A school bought music equipment for $5,004. The drums cost$2,815. How much money was spent on the other music equipment?

Find the unknown. $5,004 –$2,815 =
Estimate $5,004 –$2,815 → $5,000 –$2,800 = $2,200 1. Regroup 1 thousand, then 1 hundred, and 1 ten. 2. Subtract starting at the ones place. Check Addition shows the answer is correct. Estimation shows the answer is reasonable. So,$5,004 – $2,815 = 2,189. The unknown is 2189. Talk Math Explain where you would start regrouping to find the difference in the problem 6,000 – 3,475. Answer: 6,000 – 3,475 = 2,525. Explanation: Given the equation is 6,000 – 3,475. We will start regrouping, as minuend the digts are less than the subtrahend. So 6,000 – 3,475 = 2,525. Guided Practice Subtract. Use addition to check. Question 1. Answer: 309 – 57 = 252. 252 + 57 = 309. Explanation: Given the equation to be subtracted is 309-57 which is 272. Here, we will add 252 and 57 which is 252+57 = 309. So the answer is correct. Question 2. Answer: 2,006 – 536 = 1,470. 1,470 + 536 = 2,006. Explanation: Given the equation to be subtracted is 2,006-536 which is 1,470. Here, we will add 1,470 and 536 which is 1,470+536 = 2,006. So the answer is correct. Independent Practice Subtract. Use addition to check your answer. Question 3. Answer: 408 – 36 = 372. 372 + 36 = 408. Explanation: Given the equation to be subtracted is 408-36 which is 372. Here, we will add 372 and 36 which is 372+36 = 408. So the answer is correct. Question 4. Answer: 805 – 75 = 730. 730 + 75 = 805. Explanation: Given the equation to be subtracted is 805-75 which is 730. Here, we will add 730 and 75 which is 730+75 = 805. So the answer is correct. Question 5. Answer: 604 – 492 = 112. 112 + 492 = 604. Explanation: Given the equation to be subtracted is 604 – 492 which is 112. Here, we will add 112 and 492 which is 112+492 = 604. So the answer is correct. Algebra Subtract to find the unknown. Question 6.$9,006 – $7,474 = The unknown is$_____.
The unknown is $1,532. Explanation: Given the equation is$9,006 – $7,474, so the unknown value is$9,006 – $7,474 =$1,532.

Question 7.
8,007 – 4,836 =

The unknown is $_____. Answer: The unknown is 3,171. Explanation: Given the equation is 8,007 – 4,836, so the unknown value is 8,007 – 4,836 = 3,171. Question 8.$9,003 – $5,295 = The unknown is$_____.
The unknown is 3,708.

Explanation:
Given the equation is $9,003 –$5,295, the unknown value is 3,708.

Question 9.
3,070 – 2,021 =

The unknown is $_____. Answer: The unknown is 1,049. Explanation: Given the equation is 3,070 – 2,021, so the unknown value is 3,070 – 2,021 = 1,049. Question 10. 1,007 – 972 = The unknown is$_____.
The unknown is 35.

Explanation:
Given the equation is 1,007 – 972, so the unknown value is 1,007 – 972 = 35.

Question 11.
9,560 – 7,920 =

The unknown is $_____. Answer: The unknown is 1,640. Explanation: Given the equation is 9,560 – 7,920, so the unknown value is 1,640. Problem Solving For Exercises 12 and 13, use the prices shown. Question 12. Anton purchased the bike. He gave the clerk one$100-bill, one $50-bill, and one$20-bill. How much change should Anton receive?
The remaining change that Anton will receive is $17. Explanation: Given that Anton purchased the bike and he gave the clerk one$100-bill, one $50-bill, and one$20-bill. So Anton gave 100+50+20 which is $170. As the cost of the bike is$153, so the remaining change that Anton will receive is $170-$153 which is $17. Question 13. Mathematical PRACTICE 3 Draw a Conclusion Suppose Anton decided to purchase the skates also, after he gave the clerk his money. How much more money does Anton need to give the clerk? Answer: Anton needs to give$13.

Explanation:
As Anton has given $170 to the clerk and the total cost of the bike and skates is$153+$29 which is$189. If Antony wants to purchase the skates means he needs to give $183-$170 which is $13. HOT Problems Question 14. Mathematical PRACTICE 3 Find the Error Eva is solving the subtraction problem shown. Find and correct her mistake. Answer: 5,300 – 4,547 = 753. Explanation: Given the number sentence is 5,300 – 4,547 = 1,853. As 5,300 – 4,547 is 753. Question 15. ? Building on the Essential Question When might I need to regroup more than one time? Answer: When the minuend is less than the subtrahend then we can regroup the problem. ### McGraw Hill My Math Grade 3 Chapter 3 Lesson 7 My Homework Answer Key Practice Subtract. Use addition to check. Question 1. Answer: 507 – 94 = 413. 413+94 = 507. Explanation: Given the equation to be subtracted is 507 – 94 which is 413. Here, we will add 413 and 94 which is 413+94 = 507. So the answer is correct. Question 2. Answer: 804 – 667 = 137. 137+667 = 804. Explanation: Given that the equation to be subtracted is 804 – 667 which is 137. Here, we will add 137 and 667 which is 137+667 = 804. So the answer is correct. Question 3. Answer: 4,000 – 969 = 3,031. 3,031+969 = 4,000. Explanation: Given the equation to be subtracted is 4,000 – 969 which is 3,031. Here, we will add 3,031 and 969 which is 3,031+969 = 4,000. So the answer is correct. Subtract. Use addition to check your answer. Question 4. Answer: 7,005 – 941 = 6,064. 6,064 + 941 = 7,005. Explanation: Given the equation to be subtracted is 7,005 – 941 which is 6,064. Here, we will add 6,064 and 941 which is 6,064+941= 7,005. So the answer is correct. Question 5. Answer: 400 – 153 = 247. 247 + 153 = 400. Explanation: Given the equation to be subtracted is 400 – 153 which is 247. Here, we will add 247 and 153 which is 153+247 = 400. So the answer is correct. Question 6. Answer: 3,000 – 1,202 = 1,798. 1,798 + 1,202 = 3,000. Explanation: Given the equation to be subtracted is 3,000 – 1,202 which is 1,798. Here, we will add 1,798 and 1,202 which is 1,798+1,202 = 3,000. So the answer is correct. Algebra Subtract to find the unknown. Question 7.$3,008 – $1,053 = = ____ Answer: The unknown value is$1,955.

Explanation:
By subtracting $1,053 from$3,008, we will get $3,008-$1,053 = $1,955. So the unknown value is$1,955.

Question 8.
$8,200 – 875 = = ____ Answer:$8,200-$875 =$7,325.

Explanation:
By subtracting 875 from $8,200, we will get$8,200-$875 =$7,325. So the unknown value is $7,325. Question 9.$9,001 – 3,860 =

= ____
$9,001-$3,860 = $5,141. Explanation: By subtracting$3,860 from $9,001, we will get$9,001-$3,860 =$5,141. So the unknown value is \$5,141.

Problem Solving

Mathematical PRACTICE 2 Understand Symbols Write a number sentence.

Question 10.
A bag holds 5,300 seeds. Brandon plants 790 of the seeds. How many seeds are left?
The number of seeds left is 4,510.

Explanation:
Given that a bag holds 5,300 seeds and Brandon plants 790 of the seeds. So the number of seeds left is 5,300-790 which is 4,510 seeds. So the number sentence will be 5,300-790 = 4,510.

Question 11.
Amy’s book has 500 pages. She has read 245 pages so far. How many pages does Amy have left to read?
The number of pages Amy has left to read is 255 pages.

Explanation:
Given that Amy’s book has 500 pages and she has read 245 pages so far. So the number of pages Amy has left to read is 500-245 = 255 pages. So the number sentence will be 500-245= 255.

Test Practice

Question 12.
How many more points did Jocelyn score?

A. 64 points
B. 74 points
C. 164 points
D. 174 points
A.

Explanation:
Given that Jocelyn scores 1,040 points and Harrison scores 976 points. So Jocelyn scores 1,040-976 which is 64 points more.

Fluency Practice

Subtract.

Question 1.

94 – 13 = 81.

Explanation:
By subtracting 13 from 94, we will get 94-13 = 81.

Question 2.

63-21 = 42.

Explanation:
By subtracting 21 from 63, we will get 63-21 = 42.

Question 3.

84-73 = 11.

Explanation:
By subtracting 73 from 84, we will get 84-73 = 11.

Question 4.

63-46 = 17.

Explanation:
By subtracting 46 from 63, we will get 63-46 = 17.

Question 5.

42-27 = 15.

Explanation:
By subtracting 27 from 42, we will get 42-27 = 15.

Question 6.

74-38 = 36.

Explanation:
By subtracting 38 from 74, we will get 74-38 = 36.

Question 7.

58-29 = 29.

Explanation:
By subtracting 58 from 29, we will get 58-29 = 29.

Question 8.

89-75 = 14.

Explanation:
By subtracting 75 from 89, we will get 89-75 = 14.

Question 9.

71-56 = 15.

Explanation:
By subtracting 56 from 71, we will get 71-56 = 15.

Question 10.

88-57 = 31.

Explanation:
By subtracting 57 from 88, we will get 88-57 = 31.

Question 11.

73-59 = 14.

Explanation:
By subtracting 59 from 73, we will get 73-59 = 14.

Question 12.

92-47 = 45.

Explanation:
By subtracting 47 from 92, we will get 92-47 = 45.

Question 13.

422-83 = 339.

Explanation:
By subtracting 83 from 422, we will get 422-83 = 339.

Question 14.

111-42 = 69.

Explanation:
By subtracting 42 from 111, we will get 111-42 = 69.

Question 15.

299-82 = 217.

Explanation:
By subtracting 82 from 299, we will get 299-82 = 217.

Question 16.

604-92 = 512.

Explanation:
By subtracting 92 from 604, we will get 604-92 = 512.

Question 17.

476-229 = 247.

Explanation:
By subtracting 229 from 476, we will get 476-229 = 247.

Question 18.

800-293 = 507.

Explanation:
By subtracting 293 from 800, we will get 800-293 = 507.

Question 19.

493-310 = 183.

Explanation:
By subtracting 310 from 493, we will get 493-310 = 183.

Question 20.

395-395 = 0.

Explanation:
By subtracting 395 from 395, we will get 395-395 = 0.

Fluency practice

Subtract.

Question 1.

166-34 = 132.

Explanation:
By subtracting 34 from 166, we will get 166-34 = 132.

Question 2.

73-19 = 54.

Explanation:
By subtracting 19 from 73, we will get 73-19 = 54.

Question 3.

91-51 = 40.

Explanation:
By subtracting 51 from 91, we will get 91-51 = 40.

Question 4.

184-78 = 106.

Explanation:
By subtracting 78 from 184, we will get 184-78 = 106.

Question 5.

425-246 = 179.

Explanation:
By subtracting 246 from 425, we will get 425-246 = 179.

Question 6.

661-487 = 174.

Explanation:
By subtracting 487 from 661, we will get 661-487 = 174.

Question 7.

973-390 = 583.

Explanation:
By subtracting 390 from 973, we will get 973-390 = 583.

Question 8.

451-85 = 366.

Explanation:
By subtracting 85 from 451, we will get 451-85 = 366.

Question 9.

730-692 = 38.

Explanation:
By subtracting 692 from 730, we will get 730-692 = 38.

Question 10.

493-298 = 195.

Explanation:
By subtracting 298 from 493, we will get 493-298 which is 195.

Question 11.

671-479 = 192.

Explanation:
By subtracting 479 from 671, we will get 671-479 which is 192.

Question 12.

682-595 = 87.

Explanation:
By subtracting 595 from 682, we will get 682-595 which is 87.

Question 13.

625 – 263 = 362.

Explanation:
By subtracting 263 from 625, we will get 625-263 which is 362.

Question 14.

700 – 397 = 303.

Explanation:
By subtracting 397 from 700, we will get 700-397 which is 303.

Question 15.

990-372 = 618.

Explanation:
By subtracting 372 from 990, we will get 990-372 which is 618.

Question 16.

338-70 = 268.

Explanation:
By subtracting 70 from 338, we will get 338-70 which is 268.

Question 17.

260 – 99 = 161.

Explanation:
By subtracting 99 from 260, we will get 260-99 which is 161.

Question 18.

428-326 = 102.

Explanation:
By subtracting 428 from 326, we will get 428-326 which is 102.

Question 19.

511 – 300 = 211.

Explanation:
By subtracting 300 from 511, we will get 511-300 which is 211.

Question 20.