Let’s solve each problem step by step using base ten blocks.
Remember:
- A long green or pink rod = 10
- A small cube = 1
We’ll count the total for the left side, then the right side, add them together, and write the sum.
---
Problem 1:
Left:
3 rods (tens) → 3 × 10 = 30
4 cubes (ones) → 4
Total left = 30 + 4 =
34
Right:
2 rods → 2 × 10 = 20
3 cubes → 3
Total right = 20 + 3 =
23
Add: 34 + 23 =
57
---
Problem 2:
Left:
3 rods → 30
6 cubes → 6
Total left = 36
Right:
4 rods → 40
5 cubes → 5
Total right = 45
Add: 36 + 45 =
81
*(Check: 30+40=70, 6+5=11, 70+11=81 ✔️)*
---
Problem 3:
Left:
4 rods → 40
7 cubes → 7
Total left = 47
Right:
5 rods → 50
8 cubes → 8
Total right = 58
Add: 47 + 58 =
105
*(Check: 40+50=90, 7+8=15, 90+15=105 ✔️)*
---
Problem 4:
Left:
2 rods → 20
9 cubes → 9
Total left = 29
Right:
3 rods → 30
4 cubes → 4
Total right = 34
Add: 29 + 34 =
63
*(Check: 20+30=50, 9+4=13, 50+13=63 ✔️)*
---
Problem 5:
Left:
1 rod → 10
8 cubes → 8
Total left = 18
Right:
2 rods → 20
7 cubes → 7
Total right = 27
Add: 18 + 27 =
45
*(Check: 10+20=30, 8+7=15, 30+15=45 ✔️)*
---
Problem 6:
Left:
5 rods → 50
9 cubes → 9
Total left = 59
Right:
4 rods → 40
6 cubes → 6
Total right = 46
Add: 59 + 46 =
105
*(Check: 50+40=90, 9+6=15, 90+15=105 ✔️)*
---
Final Answer:
1. 34 + 23 = 57
2. 36 + 45 = 81
3. 47 + 58 = 105
4. 29 + 34 = 63
5. 18 + 27 = 45
6. 59 + 46 = 105
Parent Tip: Review the logic above to help your child master the concept of 2nd grade multiplication worksheets.
