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Tutorial Center • Quezon City

Addition Using Expanded Form

DepEd MATATAG Grade 1 Math • Mastery Set A: Place Value Addition
Score / 6
Name:
Grade & Section:
Date:
Direction Find each sum using expanded form. Break each 2-digit number into Tens and Ones, add the columns, and write the total sum.
💡 Mastery Model: Break into Tens + Ones:
54 + 23 = (50 + 4) + (20 + 3) = 70 + 7 = 77
1
Tens Ones
 42
=
  +  
+35
=
  +  
 
=
  +  
2
Tens Ones
 51
=
  +  
+27
=
  +  
 
=
  +  
3
Tens Ones
 36
=
  +  
+43
=
  +  
 
=
  +  
4
Tens Ones
 64
=
  +  
+25
=
  +  
 
=
  +  
5
Tens Ones
 23
=
  +  
+44
=
  +  
 
=
  +  
6
Tens Ones
 71
=
  +  
+18
=
  +  
 
=
  +  
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Kiddie Blocks
Tutorial Center • Quezon City

Addition Using Expanded Form

DepEd MATATAG Grade 1 Math • Mastery Set B: Adding with Decade Numbers
Score / 6
Name:
Grade & Section:
Date:
Direction Notice the decade numbers with zero ones! Break each number into Tens and Ones, add columns, and write the total sum.
💡 Decade Model: Remember that 50 = 50 + 0:
50 + 26 = (50 + 0) + (20 + 6) = 70 + 6 = 76
7
Tens Ones
 50
=
  +  
+34
=
  +  
 
=
  +  
8
Tens Ones
 42
=
  +  
+20
=
  +  
 
=
  +  
9
Tens Ones
 30
=
  +  
+48
=
  +  
 
=
  +  
10
Tens Ones
 63
=
  +  
+30
=
  +  
 
=
  +  
11
Tens Ones
 25
=
  +  
+50
=
  +  
 
=
  +  
12
Tens Ones
 70
=
  +  
+19
=
  +  
 
=
  +  
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📍 Tandang Sora Ave., Project 8, Quezon City | 📞 09540351970 | 🌐 kiddieblocks.com | facebook.com/kiddieblocksph
Kiddie Blocks
Tutorial Center • Quezon City

Addition Using Expanded Form

DepEd MATATAG Grade 1 Math • Mastery Set C: Fluency Challenge
Score / 6
Name:
Grade & Section:
Date:
Direction Mastery Challenge! Expand each 2-digit number into Tens and Ones, add the columns, and write the total sum.
💡 Fluency Model: Tens together + Ones together:
33 + 55 = (30 + 3) + (50 + 5) = 80 + 8 = 88
13
Tens Ones
 32
=
  +  
+46
=
  +  
 
=
  +  
14
Tens Ones
 45
=
  +  
+52
=
  +  
 
=
  +  
15
Tens Ones
 17
=
  +  
+61
=
  +  
 
=
  +  
16
Tens Ones
 54
=
  +  
+33
=
  +  
 
=
  +  
17
Tens Ones
 26
=
  +  
+62
=
  +  
 
=
  +  
18
Tens Ones
 31
=
  +  
+58
=
  +  
 
=
  +  
BOOST YOUR CHILD'S LEARNING & CREATIVITY! BOOK A PERSONALIZED SESSION TODAY!
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Teacher & Parent Solution Key

Grade 1 Mathematics • Addition with Expanded Form (Mastery Pack)
Official Answer Key
DepEd MATATAG Aligned
Page 1: Mastery Set A Solutions Core Decomposition • Sums up to 100
1. 42 + 35
(40 + 2) + (30 + 5) = 70 + 7
Sum: 77
2. 51 + 27
(50 + 1) + (20 + 7) = 70 + 8
Sum: 78
3. 36 + 43
(30 + 6) + (40 + 3) = 70 + 9
Sum: 79
4. 64 + 25
(60 + 4) + (20 + 5) = 80 + 9
Sum: 89
5. 23 + 44
(20 + 3) + (40 + 4) = 60 + 7
Sum: 67
6. 71 + 18
(70 + 1) + (10 + 8) = 80 + 9
Sum: 89
Page 2: Mastery Set B Solutions Decade Numbers & Zero Ones
7. 50 + 34
(50 + 0) + (30 + 4) = 80 + 4
Sum: 84
8. 42 + 20
(40 + 2) + (20 + 0) = 60 + 2
Sum: 62
9. 30 + 48
(30 + 0) + (40 + 8) = 70 + 8
Sum: 78
10. 63 + 30
(60 + 3) + (30 + 0) = 90 + 3
Sum: 93
11. 25 + 50
(20 + 5) + (50 + 0) = 70 + 5
Sum: 75
12. 70 + 19
(70 + 0) + (10 + 9) = 80 + 9
Sum: 89
Page 3: Mastery Set C Solutions Fluency Challenge • High-Accuracy Addition
13. 32 + 46
(30 + 2) + (40 + 6) = 70 + 8
Sum: 78
14. 45 + 52
(40 + 5) + (50 + 2) = 90 + 7
Sum: 97
15. 17 + 61
(10 + 7) + (60 + 1) = 70 + 8
Sum: 78
16. 54 + 33
(50 + 4) + (30 + 3) = 80 + 7
Sum: 87
17. 26 + 62
(20 + 6) + (60 + 2) = 80 + 8
Sum: 88
18. 31 + 58
(30 + 1) + (50 + 8) = 80 + 9
Sum: 89
MATATAG Mastery Diagnostic Rubric & Remediation Tips
Performance Level Observed Student Understanding Recommended Teacher/Tutor Next Steps
Mastery (16-18 pts) Accurately decomposes addends into tens and ones; computes sums quickly without misalignment. Advance to Grade 2 3-digit mental expanded form or introduce horizontal mental decomposition.
Developing (12-15 pts) Accurately expands nonzero digits; occasionally misses that a decade number has 0 ones (e.g. writes 5 instead of 50). Review place-value cards and practice saying decade values aloud: "5 tens is fifty, 0 ones is zero."
Needs Support (<12 pts) Adds digits across columns without understanding tens place values (e.g., adding 4 + 3 instead of 40 + 30). Use bundled popsicle sticks (10 sticks per bundle) and ones counters to anchor place value before writing.