Câu 1, 2, 3 trang 61 Vở bài tập (SBT) Toán lớp 4 tập 1. 3. Viết số thích hợp vào chỗ chấm:
1. Tính nhẩm:
a)
\(\eqalign{ & 27 \times 10 = \cr & 86 \times 10 = \cr & 358 \times 10 = \cr}\) |
\(\eqalign{ & 72 \times 10 = \cr & 103 \times 10 = \cr & 1977 \times 100 = \cr}\) |
\(\eqalign{ & 14 \times 1000 = \cr & 452 \times 1000 = \cr & 300 \times 1000 = \cr}\) |
b)
\(\eqalign{ |
\(\eqalign{ |
\(\eqalign{ |
c)
\(\eqalign{ |
\(\eqalign{ |
\(\eqalign{ |
2. Tính:
a)
\(\eqalign{
& 63 \times 100:10 = \cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = \cr}\)
b)
\(\eqalign{
& 960 \times 1000:100 = \cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = \cr}\)
c)
\(\eqalign{
& 79 \times 100:10 = \cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = \cr}\)
d)
\(\eqalign{
& 90000:1000 \times 10 = \cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = \cr}\)
3. Viết số thích hợp vào chỗ chấm:
a) 160 = 16 × …… 4500 = …… × 100 9000 = 9 × …… c) 70000 = …… × 1000 70000 = …… × 100 70000 = …… × 10 |
b) 8000 = …… × 1000 800 = …… × 100 80 = …… × 10 d) 2020000 = … × 10000 2020000 = 2020 × …… 2020000 = …… × 10 |
Bài giải:
1.
a)
\(\eqalign{ |
\(\eqalign{ |
\(\eqalign{ |
b)
\(\eqalign{ |
\(\eqalign{ |
\(\eqalign{ |
c)
\(\eqalign{ |
\(\eqalign{ |
\(\eqalign{ |
2.
a)
\(\eqalign{
& 63 \times 100:10 = 6300:10 \cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = 630 \cr}\)
b)
\(\eqalign{
& 960 \times 1000:100 = 960000:100 \cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = 9600 \cr}\)
c)
\(\eqalign{
& 79 \times 100:10 = 7900:10 \cr
& ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, = 790 \cr}\)
d)
\(\eqalign{
& 90000:1000 \times 10 = 90 \times 10 \cr
& = 900 \cr}\)
3.
a) 160 = 16 × 10 4500 = 45 × 100 9000 = 9 × 1000 c) 70000 = …… × 1000 70000 = …… × 100 70000 = …… × 10 |
b) 8000 = 8 × 1000 800 = 8 × 100 80 = 8 × 10 d) 2020000 = 202 × 10000 2020000 = 2020 × 1000 2020000 = 202000 × 10 |
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