Question

tuesday
what is the place value of the underlined digit?
3 824
write the number in expanded form.
690 = 600 + 90
circle all the odd numbers.
7 14 54 33 90 45
find the sum.
8+1=
7+5=
9+8=
4+6=
2+9=
7+4=
6+7=
9+6=
round each number to the nearest 10.
97 ____ 44 ____
755 ____ 273 ____
495 ______
round 439 to the nearest hundred.
round 681 to the nearest hundred.
use the place - value strategy to find the sum.
3 5 7
+ 1 6 4
use the place - value strategy to find the difference.
4 2 7

• 2 4 3

Explanation:

1. Place - value of 2 in 3824

The digit 2 is in the tens place. So its place - value is 20.

2. Expanded form of 690

690 = 600+90 (already correct in the given work)

3. Odd numbers

Odd numbers are not divisible evenly by 2. The odd numbers among 7, 14, 54, 33, 90, 45 are 7, 33, 45.

4. Sums

8 + 1=9
7+5 = 12
9+8 = 17
4+6 = 10
2+9 = 11
7+4 = 11
6+7 = 13
9+6 = 15

5. Rounding to nearest 10

97 rounds to 100 (since 7≥5)
44 rounds to 40 (since 4<5)
755 rounds to 760 (since 5≥5)
273 rounds to 270 (since 3<5)
495 rounds to 500 (since 5≥5)

6. Rounding to nearest 100

439 rounds to 400 (since 39<50)
681 rounds to 700 (since 81≥50)

7. Sum using place - value strategy

357+164:

• Add the ones: 7 + 4=11. Write 1 and carry 1.
• Add the tens: 5+6 + 1 (carry)=12. Write 2 and carry 1.
• Add the hundreds: 3+1+1 (carry)=5. The sum is 521.

8. Difference using place - value strategy

427−243:

• Subtract the ones: 7−3 = 4.
• Subtract the tens: 2<4, so borrow 1 from the hundreds. 12−4 = 8.
• Subtract the hundreds: 3−2 = 1. The difference is 184.

Answer:

1. Place - value of 2 in 3824: 20
2. Expanded form of 690: 600 + 90
3. Odd numbers: 7, 33, 45
4. Sums: 8 + 1 = 9; 7+5 = 12; 9+8 = 17; 4+6 = 10; 2+9 = 11; 7+4 = 11; 6+7 = 13; 9+6 = 15
5. Rounding to nearest 10: 97→100; 44→40; 755→760; 273→270; 495→500
6. Rounding to nearest 100: 439→400; 681→700
7. Sum 357+164: 521
8. Difference 427−243: 184