Multiply a one-digit number by 30.
Real questions from this skill, graded here. No account, and nothing is saved.
Grade 3 · Multiplying by Multiples of 10 · question 1 of 3
0 of 12
12 rungs. A star at the top.
2 × 30 =
0:00 of 3:11
Times 30 means 30, that many times.
30 is three tens, so the product ends with zero.
You have 3 trays of chips. Each tray holds 4 tens. Look at those 12 chips — they are 12 tens, not 12 ones.
Counting all 120 from 1 works, but it is slow, and a skipped chip spoils the total.
Each tray holds the same 4 tens, so 3 trays are 3 equal groups rather than a pile of 120.
12 tens is 120 because each ten is worth 10, and 12 of them sit in the tens place.
When the groups hold tens, multiply the groups by the tens, then say what those tens are worth.
Multiplying 3 by 4 and writing 12, as if the 4 tens were 4 chips.
The 12 you get are tens, so 12 tens is 120.
2 × 40 = ___ — 80. 2 × 4 = 8, and 8 tens are 80.
What is four times thirty?
Remember: thirty is the same as three tens.
So four times thirty means four groups of three tens — four groups of thirty.
Let's start with the small fact hiding inside: four times three.
Four times three equals twelve.
But we weren't multiplying by three — we were multiplying by thirty, three tens. So we put a zero on the end of twelve.
Twelve with a zero on the end is one hundred twenty.
Four times thirty equals one hundred twenty. Great multiplying!
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A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.
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Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.
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