Printable primary math worksheet for math grades 1 to 6 based on ... - Free Printable

To solve the problem, we need to estimate the sums by rounding each number to the nearest thousand and then adding the rounded numbers. Let's go through each row step by step.

Row 1:

1. 2,676 + 2,288
- Round 2,676 to the nearest thousand: 3,000
- Round 2,288 to the nearest thousand: 2,000
- Sum: \( 3,000 + 2,000 = 5,000 \)

2. 1,446 + 2,225
- Round 1,446 to the nearest thousand: 1,000
- Round 2,225 to the nearest thousand: 2,000
- Sum: \( 1,000 + 2,000 = 3,000 \)

3. 3,909 + 3,488
- Round 3,909 to the nearest thousand: 4,000
- Round 3,488 to the nearest thousand: 3,000
- Sum: \( 4,000 + 3,000 = 7,000 \)

Row 2:

1. 2,009 + 2,348
- Round 2,009 to the nearest thousand: 2,000
- Round 2,348 to the nearest thousand: 2,000
- Sum: \( 2,000 + 2,000 = 4,000 \)

2. 7,011 + 2,223
- Round 7,011 to the nearest thousand: 7,000
- Round 2,223 to the nearest thousand: 2,000
- Sum: \( 7,000 + 2,000 = 9,000 \)

3. 5,987 + 1,499
- Round 5,987 to the nearest thousand: 6,000
- Round 1,499 to the nearest thousand: 1,000
- Sum: \( 6,000 + 1,000 = 7,000 \)

Row 3:

1. 2,981 + 3,001
- Round 2,981 to the nearest thousand: 3,000
- Round 3,001 to the nearest thousand: 3,000
- Sum: \( 3,000 + 3,000 = 6,000 \)

2. 1,099 + 3,553
- Round 1,099 to the nearest thousand: 1,000
- Round 3,553 to the nearest thousand: 4,000
- Sum: \( 1,000 + 4,000 = 5,000 \)

3. 3,093 + 2,544
- Round 3,093 to the nearest thousand: 3,000
- Round 2,544 to the nearest thousand: 3,000
- Sum: \( 3,000 + 3,000 = 6,000 \)

Row 4:

1. 1,998 + 2,501
- Round 1,998 to the nearest thousand: 2,000
- Round 2,501 to the nearest thousand: 3,000
- Sum: \( 2,000 + 3,000 = 5,000 \)

2. 4,555 + 3,888
- Round 4,555 to the nearest thousand: 5,000
- Round 3,888 to the nearest thousand: 4,000
- Sum: \( 5,000 + 4,000 = 9,000 \)

3. 5,446 + 2,111
- Round 5,446 to the nearest thousand: 5,000
- Round 2,111 to the nearest thousand: 2,000
- Sum: \( 5,000 + 2,000 = 7,000 \)

Row 5:

1. 2,987 + 2,334
- Round 2,987 to the nearest thousand: 3,000
- Round 2,334 to the nearest thousand: 2,000
- Sum: \( 3,000 + 2,000 = 5,000 \)

2. 4,990 + 3,500
- Round 4,990 to the nearest thousand: 5,000
- Round 3,500 to the nearest thousand: 4,000
- Sum: \( 5,000 + 4,000 = 9,000 \)

3. 2,908 + 2,451
- Round 2,908 to the nearest thousand: 3,000
- Round 2,451 to the nearest thousand: 2,000
- Sum: \( 3,000 + 2,000 = 5,000 \)

Row 6:

1. 6,879 + 1,999
- Round 6,879 to the nearest thousand: 7,000
- Round 1,999 to the nearest thousand: 2,000
- Sum: \( 7,000 + 2,000 = 9,000 \)

2. 1,345 + 2,888
- Round 1,345 to the nearest thousand: 1,000
- Round 2,888 to the nearest thousand: 3,000
- Sum: \( 1,000 + 3,000 = 4,000 \)

3. 4,066 + 3,044
- Round 4,066 to the nearest thousand: 4,000
- Round 3,044 to the nearest thousand: 3,000
- Sum: \( 4,000 + 3,000 = 7,000 \)

Final Answer:

\[
\boxed{
\begin{array}{ccc}
5,000 & 3,000 & 7,000 \\
4,000 & 9,000 & 7,000 \\
6,000 & 5,000 & 6,000 \\
5,000 & 9,000 & 7,000 \\
5,000 & 9,000 & 5,000 \\
9,000 & 4,000 & 7,000 \\
\end{array}
}
\]