Math Drills

Adding Tens

Word Problems

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What this worksheet covers

Grade: Grade 1 (Elementary School)
Topic: Adding and Subtracting Tens
Worksheet: Addition

The whole lesson is built from equations that add one multiple of ten to another. Restated as a question of how many tens there are, each one is handled with the same touch as a single-digit sum. That restatement is repeated in Calculation, in the boxed items of Fill in the Blank, and again in Word Problems.

Dropping the zero from the ones place comes first, turning 40 + 30 into 7. The opposite also appears, with two zeros written side by side to give something as large as 700. Counting the digits catches either one where it stands.

Subtraction, which follows, puts exactly this view of number to work in the decreasing direction. The feature that the tens place alone moves while the ones stays at zero is carried over with it.

Word Problems6 questions

Questions & answers

Problems and answers on this worksheet

These are the problems in “Adding and Subtracting Tens”, shown with their answers.

(1)In the woods, Riley picked up 50 leaves. Riley also picked up 30 in the next woods. How many are there in all? Answer □
Answer: 80leaves
(2)At the party, Sophia has 30 chocolates in a red box and 60 in a blue box. How many are there in all? Answer □
Answer: 90chocolates
(3)At home, Liam has 10 peaches in a basket and 40 in another basket. How many are there in all? Answer □
Answer: 50peaches
(4)At home, Grace has 10 cookies baked today and 20 cookies baked yesterday. How many are there in all? Answer □
Answer: 30cookies
(5)On the mountain, 10 birds are perched in the left tree and 70 in the right tree. How many are there in all? Answer □
Answer: 80birds
(6)In the henhouse, Henry has 40 eggs in a big basket and 50 in a small basket. How many are there in all? Answer □
Answer: 90eggs

What to do next

Adding TensAdding Tens Calculation

Next unit: 2-Digit ± 1-Digit