6
9
12.HTO
6
7
1
2
5
9
13.HTO
4
9
8
3
2
7
14.HTO
2
3
6
5
8
4
15.HTO
7
4
9
1
7
8
16.HTO
3
5
2
4
8
9
17.HTO
5
8
3
2
9
7
18.HTO
1
9
4
6
6
8
19.HTO
4
5
5
3
7
6
20.HTO
2
8
7
5
4
8
Practice Set 7 • Regrouping Fluency
Name:
Date:
Score: __ / 20
Speed & Accuracy: Keep your digits lined up in their place value columns!
1.HTO
6
1
8
2
9
4
2.HTO
3
8
5
4
3
7
3.HTO
5
2
9
1
9
8
4.HTO
4
6
3
3
5
8
5.HTO
7
4
6
1
8
5
6.HTO
2
7
7
4
4
9
7.HTO
1
5
4
6
6
8
8.HTO
3
9
2
5
3
9
9.HTO
4
8
7
2
6
5
10.HTO
5
3
8
3
7
4
11.HTO
6
9
0
1
5
9
12.HTO
2
4
8
4
7
6
13.HTO
1
8
3
7
5
9
14.HTO
4
4
5
3
7
8
15.HTO
5
6
7
2
8
4
16.HTO
3
7
9
4
6
3
17.HTO
7
1
5
1
9
6
18.HTO
2
8
4
3
6
8
19.HTO
4
9
9
2
4
7
20.HTO
6
5
1
1
7
9
Practice Set 8 • Regrouping With Zeroes
Name:
Date:
Score: __ / 20
Special Focus: Take special care when a 0 is in the tens place! Don't forget to add any carried ten to the 0!
1.HTO
5
0
8
2
9
5
2.HTO
3
0
6
4
9
7
3.HTO
1
9
4
6
0
8
4.HTO
4
0
9
3
9
3
5.HTO
6
2
7
2
8
5
6.HTO
2
7
8
4
5
6
7.HTO
7
0
5
1
9
8
8.HTO
3
8
4
2
7
9
9.HTO
1
6
8
5
5
7
10.HTO
4
5
2
3
8
9
11.HTO
5
7
6
2
4
8
12.HTO
6
6
4
1
8
7
13.HTO
2
9
6
3
4
5
14.HTO
1
7
5
6
8
7
15.HTO
4
3
9
2
8
8
16.HTO
7
7
3
1
6
8
17.HTO
3
4
7
4
9
4
18.HTO
5
8
6
2
6
8
19.HTO
1
9
9
4
7
5
20.HTO
6
3
4
2
8
8
Practice Set 9 • Advanced Addition Review
Name:
Date:
Score: __ / 20
Review: Some problems require regrouping in both places; others only require one. Check each place value carefully!
1.HTO
4
5
6
3
7
8
2.HTO
2
9
3
5
6
7
3.HTO
6
8
4
1
5
9
4.HTO
1
7
8
7
6
5
5.HTO
3
4
9
4
8
3
6.HTO
5
8
7
2
5
6
7.HTO
7
2
8
1
9
7
8.HTO
2
6
5
3
7
9
9.HTO
4
9
1
2
4
9
10.HTO
6
3
4
1
8
8
11.HTO
3
7
2
5
5
9
12.HTO
1
8
6
6
4
7
13.HTO
5
6
8
3
7
5
14.HTO
2
8
3
4
7
8
15.HTO
7
5
4
1
6
9
16.HTO
3
6
2
4
7
9
17.HTO
4
2
8
3
9
6
18.HTO
5
9
5
2
4
8
19.HTO
1
4
7
6
7
6
20.HTO
3
8
5
4
9
8
Practice Set 10 • Grand Finale Addition Challenge
Name:
Date:
Score: __ / 20
Grand Finale: Congratulations on reaching Set 10! Complete these 20 problems to demonstrate your addition mastery.
1.HTO
4
8
7
3
6
5
2.HTO
5
7
9
2
8
4
3.HTO
1
9
8
6
4
3
4.HTO
7
3
6
1
8
9
5.HTO
2
5
8
4
7
7
6.HTO
3
9
4
5
2
9
7.HTO
6
4
5
2
8
6
8.HTO
1
6
7
7
5
8
9.HTO
4
7
3
3
4
8
10.HTO
5
3
9
2
9
4
11.HTO
2
8
6
6
3
5
12.HTO
3
5
1
4
6
9
13.HTO
7
6
8
1
7
4
14.HTO
4
4
2
3
8
9
15.HTO
1
9
5
5
3
8
16.HTO
6
5
7
2
7
6
17.HTO
2
7
9
4
4
8
18.HTO
5
8
3
3
6
8
19.HTO
3
9
6
4
3
7
20.HTO
4
7
8
3
8
5
12.HTO
7
4
5
−
3
1
8
13.HTO
6
8
3
−
2
5
9
14.HTO
5
9
2
−
1
6
4
15.HTO
9
5
4
−
7
2
6
16.HTO
4
7
1
−
2
3
5
17.HTO
8
8
6
−
5
4
9
18.HTO
3
6
5
−
1
3
8
19.HTO
7
9
4
−
4
6
7
20.HTO
6
5
3
−
3
2
8
Practice Set 2 • Regrouping Hundreds to Tens
Name:
Date:
Score: __ / 20
Tip: When the top tens digit is smaller than the bottom tens digit, borrow 1 hundred (10 tens) from the hundreds column!
1.HTO
7
2
8
−
3
5
4
2.HTO
6
1
9
−
2
4
5
3.HTO
8
3
7
−
4
6
2
4.HTO
5
2
6
−
1
8
3
5.HTO
9
4
8
−
5
7
1
6.HTO
4
3
9
−
2
8
5
7.HTO
7
1
5
−
3
6
2
8.HTO
8
2
4
−
4
7
1
9.HTO
6
4
7
−
2
9
3
10.HTO
5
3
8
−
1
9
2
11.HTO
9
2
9
−
6
8
4
12.HTO
7
5
6
−
4
8
2
13.HTO
8
1
7
−
3
5
2
14.HTO
6
2
5
−
2
7
1
15.HTO
4
1
8
−
1
6
3
16.HTO
9
3
6
−
5
9
1
17.HTO
5
4
9
−
2
8
4
18.HTO
7
3
4
−
3
6
1
19.HTO
8
4
5
−
4
9
2
20.HTO
6
5
8
−
1
8
3
Practice Set 3 • Double Regrouping Mastery
Name:
Date:
Score: __ / 20
Reminder: Watch out for double regrouping! Check both the ones and tens columns to see if you need to borrow twice.
1.HTO
6
4
2
−
2
7
8
2.HTO
5
3
1
−
1
6
7
3.HTO
7
2
4
−
3
8
9
4.HTO
8
5
3
−
4
7
6
5.HTO
4
1
5
−
1
8
9
6.HTO
9
3
2
−
5
6
8
7.HTO
6
2
3
−
2
7
5
8.HTO
7
4
1
−
3
9
6
9.HTO
8
1
4
−
4
5
7
10.HTO
5
6
2
−
2
8
5
11.HTO
4
3
5
−
1
7
8
12.HTO
9
2
6
−
6
4
9
13.HTO
7
5
3
−
3
8
6
14.HTO
8
4
2
−
5
7
9
15.HTO
6
1
7
−
2
5
8
16.HTO
5
2
4
−
1
6
8
17.HTO
7
3
6
−
4
5
9
18.HTO
8
6
5
−
3
8
7
19.HTO
4
2
3
−
1
8
7
20.HTO
9
4
1
−
5
6
4
Practice Set 4 • Regrouping Across Zeroes
Name:
Date:
Score: __ / 20
Zero Challenge: When borrowing across a 0 in the tens place, regroup from the hundreds first to make 10 tens, then borrow a ten!
1.HTO
5
0
4
−
2
3
8
2.HTO
7
0
2
−
3
4
5
3.HTO
6
0
5
−
2
7
9
4.HTO
4
0
1
−
1
6
4
5.HTO
8
0
3
−
4
5
6
6.HTO
9
0
6
−
5
3
8
7.HTO
6
0
2
−
1
8
7
8.HTO
7
0
5
−
3
2
9
9.HTO
5
0
1
−
2
4
6
10.HTO
8
0
7
−
3
6
8
11.HTO
4
0
3
−
1
5
9
12.HTO
9
0
4
−
6
4
7
13.HTO
7
0
1
−
2
8
4
14.HTO
6
0
8
−
3
4
9
15.HTO
5
0
6
−
1
7
8
16.HTO
8
0
2
−
4
3
5
17.HTO
4
0
5
−
2
6
8
18.HTO
9
0
1
−
5
7
4
19.HTO
7
0
6
−
3
8
9
20.HTO
6
0
4
−
2
5
7
Practice Set 5 • Mastery Assessment Check
Name:
Date:
Score: __ / 20
Mastery Check: Show your regrouping clearly in the boxes provided above each digit column!
1.HTO
7
4
2
−
3
8
5
2.HTO
6
0
3
−
2
4
7
3.HTO
8
1
5
−
4
6
8
4.HTO
5
2
4
−
1
7
9
5.HTO
9
3
6
−
6
5
8
6.HTO
4
7
1
−
2
9
4
7.HTO
7
0
8
−
3
4
9
8.HTO
8
5
2
−
3
7
6
9.HTO
6
3
4
−
2
8
7
10.HTO
5
0
7
−
2
3
8
11.HTO
9
2
1
−
5
4
6
12.HTO
4
1
3
−
1
8
5
13.HTO
7
6
4
−
3
9
8
14.HTO
8
0
5
−
4
2
7
15.HTO
6
5
2
−
2
7
9
16.HTO
5
4
1
−
1
8
6
17.HTO
9
0
2
−
6
3
5
18.HTO
7
3
5
−
4
6
8
19.HTO
8
4
3
−
5
7
6
20.HTO
6
1
4
−
3
5
8
12.HTO
7
5
1
−
2
8
6
13.HTO
5
2
4
−
3
6
9
14.HTO
9
6
2
−
4
8
5
15.HTO
6
3
7
−
2
5
9
16.HTO
8
4
1
−
5
7
6
17.HTO
7
6
3
−
3
9
8
18.HTO
5
1
5
−
2
4
8
19.HTO
9
3
4
−
6
7
9
20.HTO
6
5
2
−
3
8
7
Practice Set 7 • Regrouping Fluency
Name:
Date:
Score: __ / 20
Speed & Accuracy: Keep your digits lined up in their place value columns!
1.HTO
7
5
3
−
2
8
7
2.HTO
8
2
4
−
4
6
9
3.HTO
6
4
1
−
3
7
5
4.HTO
9
3
6
−
5
7
8
5.HTO
5
1
2
−
2
4
6
6.HTO
7
6
5
−
3
8
8
7.HTO
8
3
4
−
4
5
7
8.HTO
6
2
7
−
1
8
9
9.HTO
9
5
1
−
6
8
4
10.HTO
4
6
3
−
2
9
5
11.HTO
8
7
2
−
5
9
6
12.HTO
7
4
5
−
3
6
8
13.HTO
5
3
8
−
2
7
9
14.HTO
9
1
6
−
4
5
8
15.HTO
6
8
4
−
3
9
7
16.HTO
8
4
2
−
4
7
5
17.HTO
7
2
9
−
3
6
4
18.HTO
5
6
1
−
1
9
8
19.HTO
9
7
3
−
6
8
5
20.HTO
6
3
5
−
2
7
9
Practice Set 8 • Regrouping With Zeroes
Name:
Date:
Score: __ / 20
Special Focus: Take special care when subtracting across 0 or with a 0 in the subtrahend! Verify each column carefully.
1.HTO
8
0
0
−
3
4
6
2.HTO
6
0
0
−
2
7
3
3.HTO
7
0
0
−
4
5
8
4.HTO
5
0
0
−
1
8
9
5.HTO
9
0
0
−
5
3
4
6.HTO
4
0
0
−
1
6
7
7.HTO
6
0
4
−
2
8
0
8.HTO
8
0
2
−
3
7
0
9.HTO
7
0
5
−
4
6
0
10.HTO
5
0
8
−
2
9
0
11.HTO
9
0
3
−
5
4
0
12.HTO
6
0
7
−
3
5
0
13.HTO
8
0
1
−
4
2
5
14.HTO
7
0
3
−
2
6
8
15.HTO
5
0
2
−
1
7
9
16.HTO
9
0
5
−
6
3
8
17.HTO
6
0
1
−
3
4
7
18.HTO
8
0
4
−
5
6
9
19.HTO
7
0
2
−
3
8
5
20.HTO
9
0
0
−
4
7
8
Practice Set 9 • Advanced Subtraction Review
Name:
Date:
Score: __ / 20
Review: Some problems require regrouping in both places; others only require one. Check each place value carefully!
1.HTO
8
6
4
−
3
9
5
2.HTO
7
1
5
−
2
8
6
3.HTO
5
3
2
−
1
7
8
4.HTO
9
4
3
−
5
6
7
5.HTO
6
2
8
−
3
7
4
6.HTO
8
0
5
−
4
3
8
7.HTO
7
5
1
−
4
8
9
8.HTO
6
9
4
−
2
3
8
9.HTO
9
1
2
−
6
4
5
10.HTO
5
7
3
−
3
9
2
11.HTO
8
3
6
−
4
7
9
12.HTO
7
0
4
−
3
5
6
13.HTO
6
5
7
−
2
8
4
14.HTO
9
2
8
−
5
6
9
15.HTO
4
8
3
−
1
9
5
16.HTO
7
6
2
−
3
8
7
17.HTO
8
4
1
−
4
9
6
18.HTO
5
2
0
−
2
7
4
19.HTO
9
7
5
−
6
9
8
20.HTO
6
3
4
−
1
5
9
Practice Set 10 • Grand Finale Subtraction Challenge
Name:
Date:
Score: __ / 20
Grand Finale: Congratulations on reaching Set 10! Complete these 20 problems to demonstrate your subtraction mastery.
1.HTO
9
1
4
−
4
5
8
2.HTO
8
0
3
−
3
4
7
3.HTO
7
4
2
−
2
8
9
4.HTO
6
2
5
−
3
6
8
5.HTO
8
5
1
−
4
7
6
6.HTO
5
3
4
−
2
7
9
7.HTO
9
0
7
−
5
4
8
8.HTO
7
6
3
−
3
8
5
9.HTO
6
8
2
−
2
9
7
10.HTO
8
1
6
−
4
5
9
11.HTO
4
2
5
−
1
8
7
12.HTO
9
3
0
−
5
7
4
13.HTO
7
5
4
−
3
8
8
14.HTO
8
0
2
−
4
6
5
15.HTO
6
4
1
−
2
7
5
16.HTO
5
1
7
−
1
8
9
17.HTO
9
6
3
−
6
8
7
18.HTO
7
2
8
−
4
5
9
19.HTO
8
4
5
−
3
7
8
20.HTO
6
0
0
−
3
2
5
