Place Value Tens/Ones

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Answer Key & Explanations

Place Value Tens/Ones · Grade 1 · Worksheet 2

1. Expand 73: __ tens + __ ones Answer: 7 tens + 3 ones Solution: Look at the number 73. The first digit is 7, which is in the tens place. This means there are 7 tens.
   Full step-by-step solution

   Step 1: Look at the number 73. The first digit is 7, which is in the tens place. This means there are 7 tens. Step 2: The second digit is 3, which is in the ones place. This means there are 3 ones. Step 3: So, 73 expands to 7 tens + 3 ones.

2. How many tens in 89? Answer: 8 Solution: The number 89 is a two-digit number. The first digit (8) tells us how many tens are in the number.
   Full step-by-step solution

   Step 1: The number 89 is a two-digit number. Step 2: The first digit (8) tells us how many tens are in the number. Step 3: Therefore, there are 8 tens in 89. The answer is 8.

3. Liam is looking at a picture of base ten blocks. There are 5 tens rods and 0 ones cubes. What number is shown? Answer: 50 Solution: Count the tens rods. There are 5 tens rods. Step 2: Each tens rod equals 10.
   Full step-by-step solution

   Step 1: Count the tens rods. There are 5 tens rods. Step 2: Each tens rod equals 10. So 5 tens means 5 groups of 10. Step 3: 5 tens = 50. Step 4: There are 0 ones cubes, so we add 0. Step 5: 50 + 0 = 50. The number shown is 50.

4. Liam has 3 packs of crayons. Each pack has 10 crayons. How many crayons does Liam have in total? Answer: 30 Solution: Liam has 3 packs of crayons. Each pack has 10 crayons. To find the total number of crayons, we multiply the number of packs by the number of crayons in each pack.
   Full step-by-step solution

   Liam has 3 packs of crayons. Each pack has 10 crayons. To find the total number of crayons, we multiply the number of packs by the number of crayons in each pack. Step 1: Write the multiplication expression. 3 packs × 10 crayons per pack Step 2: Perform the multiplication. 3 × 10 = 30 Step 3: State the final answer. Liam has 30 crayons in total.

5. 24 = ? tens + ? ones Answer: 2 tens + 4 ones Solution: We are given the number 24 and need to break it into tens and ones. In the number 24, the digit "2" is in the tens place, and the digit "4" is in the ones place. Determine the value of the tens.
   Full step-by-step solution

   Step-by-step solution: We are given the number 24 and need to break it into tens and ones. Step 1: Understand the place values. In the number 24, the digit "2" is in the tens place, and the digit "4" is in the ones place. Step 2: Determine the value of the tens. The digit in the tens place is 2. This means we have 2 groups of ten. Calculation: 2 tens = 2 × 10 = 20. Step 3: Determine the value of the ones. The digit in the ones place is 4. This means we have 4 single ones. Calculation: 4 ones = 4 × 1 = 4. Step 4: Verify the total. Add the value of the tens and the ones together to make sure it equals the original number. 20 (from the tens) + 4 (from the ones) = 24. This matches the original number, so our breakdown is correct. Final Answer: 2 tens + 4 ones

6. Sophia is sorting her collection of toy dinosaurs. She puts them into groups of ten. She has 8 groups of ten dinosaurs and 4 single dinosaurs. How many toy dinosaurs does Sophia have in total? Answer: 84 Solution: Sophia has 8 groups of ten dinosaurs. Each group has 10 dinosaurs. So, 8 groups of ten is 8 × 10 = 80 dinosaurs.
   Full step-by-step solution

   Step 1: Sophia has 8 groups of ten dinosaurs. Each group has 10 dinosaurs. So, 8 groups of ten is 8 × 10 = 80 dinosaurs. Step 2: Sophia also has 4 single dinosaurs. Step 3: Add the dinosaurs from the groups and the single dinosaurs: 80 + 4 = 84. Sophia has 84 toy dinosaurs in total.

7. Mere is arranging her flower pots. She has 4 groups of 10 pots and 6 single pots. How many flower pots does Mere have in total? Answer: 46 Solution: Count the pots in the groups of ten: 4 groups x 10 pots = 40 pots. Count the single pots: 6 pots. Add them together: 40 + 6 = 46.
   Full step-by-step solution

   Step 1: Count the pots in the groups of ten: 4 groups x 10 pots = 40 pots. Step 2: Count the single pots: 6 pots. Step 3: Add them together: 40 + 6 = 46. Mere has 46 flower pots in total.

8. Lily is counting her toy bears. She has 2 groups of 10 bears and 7 single bears. How many toy bears does Lily have in total? Answer: 27 Solution: Count the bears in groups of ten. 2 groups of 10 bears = 20 bears. Count the single bears.
   Full step-by-step solution

   Step 1: Count the bears in groups of ten. 2 groups of 10 bears = 20 bears. Step 2: Count the single bears. There are 7 single bears. Step 3: Add them together. 20 + 7 = 27. The answer is 27.

9. Mason has a pile of base ten blocks. He has 8 tens rods and 9 ones cubes. What number do his blocks show? Answer: 89 Solution: Count the tens rods. There are 8 tens rods. Each tens rod equals 10.
   Full step-by-step solution

   Step 1: Count the tens rods. There are 8 tens rods. Each tens rod equals 10. So 8 tens = 80. Step 2: Count the ones cubes. There are 9 ones cubes. Each ones cube equals 1. So 9 ones = 9. Step 3: Add the tens and ones together: 80 + 9 = 89. The number shown is 89.