Place Value to 120: practice solutions, Grade 1 – download the PDF

1 Count on by ones ★★★

Count on one at a time: after 49 comes 50, then 51, then 52.

The missing numbers are 50, 51, 52.

2 Name the blocks ★★★

There are 2 rods, so 2 tens. There are 5 cubes, so 5 ones.

\(20 + 5 = 25\). The blocks show 25.

3 Tens and ones ★★★

1. \(30 + 6 = 36\)
2. \(50 + 0 = 50\)
3. \(80 + 2 = 82\)

The numbers are 36, 50, and 82.

4 How many tens? ★★★

1. 61 has 6 tens and 1 one.
2. 40 has 4 tens and 0 ones.
3. 78 has 7 tens and 8 ones.

5 Greater, less, or equal ★★★

1. 2 tens is less than 3 tens, so \(23 \lt 32\).
2. Both numbers are the same, so \(45 = 45\).
3. 6 tens is more than 5 tens, so \(60 \gt 59\).

6 Count by tens ★★★

Add one ten each time: 10, 20, 30, 40, 50, 60.

7 Ten more ★★★

Add one to the tens digit and keep the ones digit.

1. 34 becomes 44.
2. 52 becomes 62.
3. 70 becomes 80.

8 Bundles of craft sticks ★★★

1. 42 is 4 tens and 2 ones. She makes 4 bundles and has 2 loose sticks.
2. \(42 + 8 = 50\). Now she has 5 bundles and 0 loose sticks, because the 2 loose sticks and the 8 new sticks make one more ten.

9 Move on the chart ★★★

1. One row down is ten more: \(43 + 10 = 53\). The number is 53.
2. One row up is ten less: \(43 - 10 = 33\). The number is 33.

10 Ten less ★★★

1. 8 tens become 7 tens, so 85 becomes 75.
2. Ten less than 100 is 90.
3. 12 tens become 11 tens, so 120 becomes 110.

11 Fill the missing digit ★★★

1. 59 is 5 tens and 9 ones. The missing digit is 5.
2. 74 is 7 tens and 4 ones. The missing digit is 4.
3. 38 is 3 tens and 8 ones. The missing digit is 8.

12 Order the numbers ★★★

Compare the tens: 4 tens, 5 tens, 8 tens, 9 tens.

The order from least to greatest is 49, 58, 85, 94.

13 Read the number line ★★★

1. A is at 104, B is at 111, and C is at 118.
2. B is 1 away from 110. A is 6 away and C is 8 away. Point B is closest to 110.

14 Boxes of crayons ★★★

6 boxes of ten is 6 tens, or 60. Add the 4 loose crayons: \(60 + 4 = 64\).

Leo has 64 crayons.

15 True or false ★★★

1. False. 5 tens is less than 8 tens, so \(58 \lt 85\).
2. False. 7 tens and 3 ones is \(70 + 3 = 73\), not 37.
3. True. 99 is 9 tens and 9 ones. Ten more is 10 tens and 9 ones, and that is 109.

16 Mystery numbers ★★★

1. My tens digit is 6, so my ones digit is \(6 + 3 = 9\). The number is 69.
2. My tens digit is 6, so my ones digit must be \(7 - 6 = 1\). The number is 61.

17 Which digits fit? ★★★

The tens are the same, so the ones digit must be greater than 4.

The digits are 5, 6, 7, 8, and 9, which make 65, 66, 67, 68, and 69.

18 Count past one hundred ★★★

The next nine numbers are 98, 99, 100, 101, 102, 103, 104, 105, 106.

The number right after 109 is 110. The number right before 120 is 119.

19 Tens and ones past 99 ★★★

Ten tens make 100, so after 99 we keep adding tens.

1. 105 is 10 tens and 5 ones.
2. 114 is 11 tens and 4 ones.
3. 120 is 12 tens and 0 ones.

20 Muffins for sale ★★★

Ten less than 64 is 54. Ten less than 54 is 44. After lunch the bakery has 44 muffins.

Ten more than 44 is 54. Now the bakery has 54 muffins.

21 Find the mistake ★★★

Sam is not right. He only looked at the ones digits. He must compare the tens first.

39 has 3 tens and 41 has 4 tens. Since 3 tens is less than 4 tens, \(39 \lt 41\).