Problem Description:
The task involves performing mental math operations (adding or subtracting 100) on a series of numbers. The goal is to solve each row correctly and then color the trophy if all calculations in that row are accurate.
Solution:
#### Row 1:
-
542 + 100:
Add 100 to 542:
\( 542 + 100 = 642 \)
-
373 - 100:
Subtract 100 from 373:
\( 373 - 100 = 273 \)
-
288 + 100:
Add 100 to 288:
\( 288 + 100 = 388 \)
Row 1 Results:
642, 273, 388
---
#### Row 2:
-
869 + 100:
Add 100 to 869:
\( 869 + 100 = 969 \)
-
432 - 100:
Subtract 100 from 432:
\( 432 - 100 = 332 \)
-
513 + 100:
Add 100 to 513:
\( 513 + 100 = 613 \)
Row 2 Results:
969, 332, 613
---
#### Row 3:
-
934 - 100:
Subtract 100 from 934:
\( 934 - 100 = 834 \)
-
444 + 100:
Add 100 to 444:
\( 444 + 100 = 544 \)
-
394 - 100:
Subtract 100 from 394:
\( 394 - 100 = 294 \)
Row 3 Results:
834, 544, 294
---
#### Row 4:
-
774 + 100:
Add 100 to 774:
\( 774 + 100 = 874 \)
-
278 + 100:
Add 100 to 278:
\( 278 + 100 = 378 \)
-
122 - 100:
Subtract 100 from 122:
\( 122 - 100 = 22 \)
Row 4 Results:
874, 378, 22
---
#### Row 5:
-
631 - 100:
Subtract 100 from 631:
\( 631 - 100 = 531 \)
-
598 - 100:
Subtract 100 from 598:
\( 598 - 100 = 498 \)
-
302 + 100:
Add 100 to 302:
\( 302 + 100 = 402 \)
Row 5 Results:
531, 498, 402
---
Final Answer:
The completed rows with the correct results are:
1.
642, 273, 388
2.
969, 332, 613
3.
834, 544, 294
4.
874, 378, 22
5.
531, 498, 402
If all calculations are correct, you can color the trophy for each row.
Final Answer Boxed:
\[
\boxed{642, 273, 388; 969, 332, 613; 834, 544, 294; 874, 378, 22; 531, 498, 402}
\]
Parent Tip: Review the logic above to help your child master the concept of hundreds worksheet 2nd grade.
