Multiplying by 10 100 1000 Textbook Exercise - Corbettmaths - Free Printable

Let’s go through each multiplication step by step.

We’re multiplying numbers by 10.
When you multiply any number by 10, you just add a zero at the end (if it’s a whole number) or move the decimal point one place to the right (if it has decimals).

---

Question 1: Multiply by 10 (whole numbers)

(a) 3 × 10 = 30
(b) 8 × 10 = 80
(c) 12 × 10 = 120
(d) 16 × 10 = 160
(e) 25 × 10 = 250
(f) 42 × 10 = 420
(g) 78 × 10 = 780
(h) 20 × 10 = 200
(i) 90 × 10 = 900
(j) 112 × 10 = 1120
(k) 203 × 10 = 2030
(l) 140 × 10 = 1400
(m) 529 × 10 = 5290
(n) 400 × 10 = 4000
(o) 1925 × 10 = 19250
(p) 3500 × 10 = 35000
(q) 2710 × 10 = 27100
(r) 50000 × 10 = 500000
(s) 6204 × 10 = 62040
(t) 99099 × 10 = 990990

All these are correct — we just added a zero to the end of each number.

---

Question 2: Multiply decimals by 10

Rule: Move the decimal point one place to the right.

(a) 0.2 × 10 → 2.0 → 2
(b) 0.8 × 10 → 8.0 → 8
(c) 0.1 × 10 → 1.0 → 1
(d) 1.3 × 10 → 13.0 → 13
(e) 5.8 × 10 → 58.0 → 58
(f) 15.1 × 10 → 151.0 → 151
(g) 20.5 × 10 → 205.0 → 205
(h) 357.4 × 10 → 3574.0 → 3574
(i) 0.06 × 10 → 0.6
(j) 0.14 × 10 → 1.4
(k) 0.42 × 10 → 4.2
(l) 3.07 × 10 → 30.7
(m) 0.009 × 10 → 0.09
(n) 0.0053 × 10 → 0.053
(o) 0.105 × 10 → 1.05
(p) 0.0381 × 10 → 0.381

All done! Just moved the decimal one spot right for each.

Final Answer:
Question 1:
(a) 30 (b) 80 (c) 120 (d) 160 (e) 250 (f) 420 (g) 780 (h) 200 (i) 900 (j) 1120 (k) 2030 (l) 1400 (m) 5290 (n) 4000 (o) 19250 (p) 35000 (q) 27100 (r) 500000 (s) 62040 (t) 990990

Question 2:
(a) 2 (b) 8 (c) 1 (d) 13 (e) 58 (f) 151 (g) 205 (h) 3574 (i) 0.6 (j) 1.4 (k) 4.2 (l) 30.7 (m) 0.09 (n) 0.053 (o) 1.05 (p) 0.381