Adding and Subtracting Within 100: math test solutions, Grade 1 – download the PDF

1 Tens and ones / 4 pts

a. \(50 + 3 = 53\) (1 pt)

b. 70 is 7 tens. (1 pt)

c. \(64 + 10 = 74\) (1 pt)

d. \(38 - 10 = 28\) (1 pt)

2 Add ones / 4 pts

1. \(2 + 6 = 8\), so \(32 + 6 = 38\). (1 pt)
2. \(5 + 4 = 9\), so \(55 + 4 = 59\). (1 pt)
3. \(9 + 5 = 14\), so 1 new ten: \(49 + 5 = 54\). (1 pt)
4. \(6 + 8 = 14\), so 1 new ten: \(66 + 8 = 74\). (1 pt)

3 Add tens / 3 pts

1. 2 tens + 4 tens = 6 tens, 3 ones: \(23 + 40 = 63\). (1 pt)
2. 5 tens + 3 tens = 8 tens: \(50 + 30 = 80\). (1 pt)
3. 3 tens + 2 tens = 5 tens, 8 ones: \(38 + 20 = 58\). (1 pt)

4 Subtract tens / 3 pts

1. 9 tens − 6 tens = 3 tens: \(90 - 60 = 30\). (1 pt)
2. 8 tens − 4 tens = 4 tens: \(80 - 40 = 40\). (1 pt)
3. 7 tens − 1 ten = 6 tens: \(70 - 10 = 60\). (1 pt)

5 Pet shop / 3 pts

Number sentence: \(37 + 6\). (1 pt)

\(7 + 6 = 13\) ones, which is 1 ten and 3 ones. \(3 + 1 = 4\) tens, so \(37 + 6 = 43\). (1 pt)

Answer: The pet shop has 43 fish now. (1 pt)

6 Number line / 3 pts

a. \(46 \to 56 \to 66 \to 76\). You land on 76. (1 pt)

b. \(46 + 30 = 76\) (1 pt)

c. Example: “I hopped forward three times by ten, so I added 3 tens and the ones stayed 6.” (1 pt)