Grade 1 Math Practice Test: Adding and Subtracting Tens

Adding 10 adds one ten: 4 tens become 5 tens, so 46 becomes 56. The answer 47 is only 1 more.

Taking away 10 removes one ten: 7 tens become 6 tens, so the answer is 62. The ones digit stays 2.

3 tens and 4 tens make 7 tens, which is 70. The answer 7 forgets that these are tens, not ones.

8 tens take away 5 tens leaves 3 tens, which is 30. The answer 130 adds instead of subtracting.

Add the ones: 4 + 5 = 9. The tens stay 3, so 34 + 5 = 39. The answer 84 adds the 5 to the tens by mistake.

30 is 3 tens. 2 tens + 3 tens = 5 tens, and the 5 ones stay: 55. The answer 28 adds 3 ones instead of 3 tens.

7 + 6 = 13 ones, which is 1 ten and 3 ones. Now there are 5 tens and 3 ones: 53. Writing 413 forgets to trade 10 ones for a ten.

6 tens take away 2 tens leaves 4 tens, which is 40.

Jon starts with 34 crayons. Two more boxes add 20: 34 + 20 = 54. The answer 36 adds only 2 crayons, not 2 tens.

58 + 20 = 78, which is 7 tens and 8 ones. Adding 2 tens changes the tens digit from 5 to 7 and leaves the 8 ones alone.