SME
Grade 1 Math · Number & Base Ten
Place value: tens and ones
Use this for “How many tens and how many ones make 45?”
Picture
45: forty-five
Rods are tens, small cubes are ones.
This is an example. Type the numbers from your problem to start.
Number
=
Tens
tens
+
Ones
ones
Number sentences
45 = 4 tens + 5 ones
45 has 4 full tens
45 has 5 ones left over
Good to know
•
A ten is a group of 10 ones.
•
In a 2-digit number, the left digit tells the tens. The right digit tells the ones.
•
Trade 10 ones for 1 ten. Type the tens and the ones to find the number.
Step-by-step
WE KNOW
Number: 45
FIND
tens, ones
Step 1 · Find tens
45 has ? full tens
Count the rods. Each rod is a ten.
45 = 40 + 5
40 is 4 tens
Tens: 4
Step 2 · Find ones
45 has ? ones left over
Count what is left after the full tens.
5 ones are left
Ones: 5
Check
Put the numbers back in. Both sides should match.
45 = 4 tens + 5 ones ✓
45 has 4 full tens ✓
45 has 5 ones left over ✓
Topic check
See what you know: 5 questions on this topic
New questions each time. Pass to mark it complete.