Here is the complete solution to the "Multiplication Day 3" worksheet. Each problem is solved step-by-step with an explanation where helpful.
---
Solutions:
1) 11 × 10 = 110
*Explanation:* Multiplying by 10 adds a zero to the end of the number. So, 11 becomes 110.
2) 18 × 10 = 180
*Explanation:* Again, multiplying by 10 → add a zero: 18 → 180.
3) 9 × 13 = 117
*Explanation:* Break it down: 9×10 = 90, 9×3 = 27; then 90 + 27 = 117.
4) 7 × 20 = 140
*Explanation:* 7×2 = 14, then add a zero → 140.
5) 15 × 16 = 240
*Explanation:* Use distributive property: 15×10 = 150, 15×6 = 90; 150+90=240.
6) 15 × 14 = 210
*Explanation:* 15×10 = 150, 15×4 = 60; 150+60=210.
7) 16 × 19 = 304
*Explanation:* 16×20 = 320, minus 16×1 = 16 → 320 - 16 = 304.
8) 12 × 20 = 240
*Explanation:* 12×2 = 24, add a zero → 240.
9) 19 × 8 = 152
*Explanation:* 20×8 = 160, minus 1×8 = 8 → 160 - 8 = 152.
10) 20 × 15 = 300
*Explanation:* 2×15 = 30, add a zero → 300.
11) 20 × 15 = 300
*(Same as #10)*
12) 11 × 12 = 132
*Explanation:* 10×12 = 120, 1×12 = 12; 120+12=132.
13) 7 × 12 = 84
*Explanation:* 7×10 = 70, 7×2 = 14; 70+14=84.
14) 18 × 8 = 144
*Explanation:* 10×8 = 80, 8×8 = 64; 80+64=144.
15) 17 × 14 = 238
*Explanation:* 17×10 = 170, 17×4 = 68; 170+68=238.
16) 16 × 12 = 192
*Explanation:* 16×10 = 160, 16×2 = 32; 160+32=192.
17) 16 × 18 = 288
*Explanation:* 16×20 = 320, minus 16×2 = 32 → 320 - 32 = 288.
18) 17 × 8 = 136
*Explanation:* 10×8 = 80, 7×8 = 56; 80+56=136.
19) 12 × 10 = 120
*Explanation:* Add a zero to 12 → 120.
20) 17 × 10 = 170
*Explanation:* Add a zero to 17 → 170.
21) 13 × 13 = 169
*Explanation:* 13² = (10+3)² = 100 + 2×10×3 + 9 = 100 + 60 + 9 = 169.
22) 7 × 20 = 140
*(Same as #4)*
23) 12 × 12 = 144
*Explanation:* 12² = 144 (memorized fact or: 10×12=120, 2×12=24; 120+24=144).
24) 19 × 12 = 228
*Explanation:* 20×12 = 240, minus 1×12 = 12 → 240 - 12 = 228.
25) 17 × 16 = 272
*Explanation:* 17×10 = 170, 17×6 = 102; 170+102=272.
---
✔ Final Answer Key:
1)
110
2)
180
3)
117
4)
140
5)
240
6)
210
7)
304
8)
240
9)
152
10)
300
11)
300
12)
132
13)
84
14)
144
15)
238
16)
192
17)
288
18)
136
19)
120
20)
170
21)
169
22)
140
23)
144
24)
228
25)
272
---
You can now fill in the answers on your worksheet and score yourself out of 25! Let me know if you’d like to review any specific problem. 😊
Parent Tip: Review the logic above to help your child master the concept of grade 5 multiplication worksheet.
