Multiplying Large Numbers

The same four pieces, with bigger numbers.

10 problems · about 16 minutes · 5.NBT.B.5

NameDate

Figure — use these to answer the problems

Both numbers split by place value. Each piece is one partial product.

403

105

40030

20015

First number43

Second number15

Figure 1

From earlier lessons. Loosen up before the new work.

2 problems

From “Rounding Decimals”
Round 7.63 to the nearest whole number.
Answer
2
From “Comparing Decimals to Thousandths”
Which is bigger, 0.608 or 0.61?
- 0.61.
- 0.608.

Straightforward practice. Get the method working first.

4 problems

124 × 12 = ?
Answer
4
Why estimate before multiplying?
- It catches an answer of the wrong size.
- It is faster than multiplying.
132 × 4 = ?
Answer
45 × 23 = ?
Answer

The same ideas with more to keep track of.

2 problems

Mixed problems. Work out what kind of question it is before you start.

2 problems